//-- variabelen
        currency_symbol = "€"
        m2_symbol       = { metric : "m2",  imperial : "Sq.ft."};
        m3_symbol       = { metric : "m3",  imperial : "Cu.ft."};
        c_symbol        = { metric : "°C",  imperial : "F"};
        kg_symbol       = { metric : "kg",  imperial : "lb"};
        is_metric       = true;
        
        m2i_m2_factor   = 10.764;
        m2i_m3_factor   = 35.315;
        m2i_c_factor1   = 32;
        m2i_c_factor2   = 1.8;
        m2i_kg_factor   = 2.2046;
        
        metric_string   = "Metric";
        imperial_string = "Imperial";
        
        //-- rijen 
        r_window = new Array('r_gvalue', 'r_uvalue', 'r_ltvalue');
        r_airco  = new Array('r_sunm2', 'r_sunall', 'r_elecsave', 'r_elecco2', 'r_elecco2save', 'r_aircocosts');
        r_heat   = new Array('r_heatloss', 'r_gasneeded', 'r_gassave', 'r_gasco2', 'r_gasco2save', 'r_heatcosts');
        
        ws_current = {
            1 : { "window_id" : 1, "name" : "Single 3mm clear float glazing", "g" : 87.00, "u" : 5.90, "lt" : 87 },
            2 : { "window_id" : 1, "name" : "Single 3mm clear float glazing + Common black screen 5% OF", "g" : 54.00, "u" : 2.70, "lt" : 5 },
            3 : { "window_id" : 1, "name" : "Single 3mm clear float glazing + Common white screen 5% OF", "g" : 28.00, "u" : 2.70, "lt" : 21 },
            6 : { "window_id" : 2, "name" : "Double 6mm clear float glazing", "g" : 71.00, "u" : 2.60, "lt" : 79 },
            7 : { "window_id" : 2, "name" : "Double 6mm clear float glazing + Common black screen 5% OF", "g" : 55.00, "u" : 1.80, "lt" : 4 },
            8 : { "window_id" : 2, "name" : "Double 6mm clear float glazing + Common white screen 5% OF", "g" : 30.00, "u" : 1.80, "lt" : 20 },
            11 : { "window_id" : 3, "name" : "Low-E glazing example", "g" : 64.00, "u" : 1.30, "lt" : 80 },
            12 : { "window_id" : 3, "name" : "Low-E glazing example + Common black screen 5% OF", "g" : 52.00, "u" : 0.90, "lt" : 4 },
            13 : { "window_id" : 3, "name" : "Low-E glazing example + Common white screen 5% OF", "g" : 29.00, "u" : 0.90, "lt" : 20 },
            16 : { "window_id" : 4, "name" : "Solar Control glazing example", "g" : 37.00, "u" : 1.10, "lt" : 67 },
            17 : { "window_id" : 4, "name" : "Solar Control glazing example + Common black screen 5% OF", "g" : 32.00, "u" : 0.90, "lt" : 4 },
            18 : { "window_id" : 4, "name" : "Solar Control glazing example + Common white screen 5% OF", "g" : 29.00, "u" : 0.90, "lt" : 20 },
            21 : { "window_id" : 6, "name" : "Solar bronze 6 mm single", "g" : 61.00, "u" : 5.80, "lt" : 53 },
            22 : { "window_id" : 6, "name" : "Solar bronze 6 mm single + Common black screen 5% OF", "g" : 36.00, "u" : 2.70, "lt" : 3 },
            23 : { "window_id" : 6, "name" : "Solar bronze 6 mm single + Common white screen 5% OF", "g" : 23.00, "u" : 2.70, "lt" : 12 }
        }
        
        ws_new = {
            4 : { "window_id" : 1, "name" : "Single 3mm clear float glazing + SilverScreen Black", "g" : 20.00, "u" : 1.70, "lt" : 5 },
            5 : { "window_id" : 1, "name" : "Single 3mm clear float glazing + SilverScreen White", "g" : 21.00, "u" : 1.70, "lt" : 6 },
            9 : { "window_id" : 2, "name" : "Double 6mm clear float glazing + SilverScreen Black", "g" : 23.00, "u" : 1.10, "lt" : 5 },
            10 : { "window_id" : 2, "name" : "Double 6mm clear float glazing + SilverScreen White", "g" : 24.00, "u" : 1.10, "lt" : 6 },
            14 : { "window_id" : 3, "name" : "Low-E glazing example + SilverScreen Black", "g" : 24.00, "u" : 0.80, "lt" : 5 },
            15 : { "window_id" : 3, "name" : "Low-E glazing example + SilverScreen White", "g" : 25.00, "u" : 0.80, "lt" : 6 },
            19 : { "window_id" : 4, "name" : "Solar Control glazing example + SilverScreen Black", "g" : 14.00, "u" : 0.70, "lt" : 4 },
            20 : { "window_id" : 4, "name" : "Solar Control glazing example + SilverScreen White", "g" : 14.00, "u" : 0.70, "lt" : 4 },
            24 : { "window_id" : 6, "name" : "Solar bronze 6 mm single + SilverScreen Black", "g" : 16.00, "u" : 1.70, "lt" : 3 },
            25 : { "window_id" : 6, "name" : "Solar bronze 6 mm single + SilverScreen White", "g" : 16.00, "u" : 1.70, "lt" : 3 }
        }
        
/*
        ws_current  = { 
            1 : { "name" : "Single 3mm clear float glazing", "g" : 87.00, "u" : 5.90, "lt" : 87 },
            2 : { "name" : "Double 6mm clear float glazing", "g" : 71.00, "u" : 2.60, "lt" : 79 },
            3 : { "name" : "Low-E glazing example", "g" : 64.00, "u" : 1.30, "lt" : 80 },
            4 : { "name" : "Solar Control glazing example", "g" : 37.00, "u" : 1.10, "lt" : 67 },
            6 : { "name" : "Solar bronze 6 mm single", "g" : 61.00, "u" : 5.80, "lt" : 53 }
        };
                      
        
        ws_new      = { 
            2 : { "parent" : 1, "name" : "Common black screen 5% OF + Single 3mm clear float glazing", "g" : 54.00, "u" : 2.70, "lt" : 5 },
            3 : { "parent" : 1, "name" : "Common white screen 5% OF + Single 3mm clear float glazing", "g" : 28.00, "u" : 2.70, "lt" : 21 },
            4 : { "parent" : 1, "name" : "SilverScreen Black + Single 3mm clear float glazing", "g" : 20.00, "u" : 1.70, "lt" : 5 },
            5 : { "parent" : 1, "name" : "SilverScreen White + Single 3mm clear float glazing", "g" : 21.00, "u" : 1.70, "lt" : 6 },
            7 : { "parent" : 2, "name" : "Common black screen 5% OF + Double 6mm clear float glazing", "g" : 55.00, "u" : 1.80, "lt" : 4 },
            8 : { "parent" : 2, "name" : "Common white screen 5% OF + Double 6mm clear float glazing", "g" : 30.00, "u" : 1.80, "lt" : 20 },
            9 : { "parent" : 2, "name" : "SilverScreen Black + Double 6mm clear float glazing", "g" : 23.00, "u" : 1.10, "lt" : 5 },
            10 : { "parent" : 2, "name" : "SilverScreen White + Double 6mm clear float glazing", "g" : 24.00, "u" : 1.10, "lt" : 6 },
            12 : { "parent" : 3, "name" : "Common black screen 5% OF + Low-E glazing example", "g" : 52.00, "u" : 0.90, "lt" : 4 },
            13 : { "parent" : 3, "name" : "Common white screen 5% OF + Low-E glazing example", "g" : 29.00, "u" : 0.90, "lt" : 20 },
            14 : { "parent" : 3, "name" : "SilverScreen Black + Low-E glazing example", "g" : 24.00, "u" : 0.80, "lt" : 5 },
            15 : { "parent" : 3, "name" : "SilverScreen White + Low-E glazing example", "g" : 25.00, "u" : 0.80, "lt" : 6 },
            17 : { "parent" : 4, "name" : "Common black screen 5% OF + Solar Control glazing example", "g" : 32.00, "u" : 0.90, "lt" : 4 },
            18 : { "parent" : 4, "name" : "Common white screen 5% OF + Solar Control glazing example", "g" : 29.00, "u" : 0.90, "lt" : 20 },
            19 : { "parent" : 4, "name" : "SilverScreen Black + Solar Control glazing example", "g" : 14.00, "u" : 0.70, "lt" : 4 },
            20 : { "parent" : 4, "name" : "SilverScreen White + Solar Control glazing example", "g" : 14.00, "u" : 0.70, "lt" : 4 },
            22 : { "parent" : 6, "name" : "Common black screen 5% OF + Solar bronze 6 mm single", "g" : 36.00, "u" : 2.70, "lt" : 3 },
            23 : { "parent" : 6, "name" : "Common white screen 5% OF + Solar bronze 6 mm single", "g" : 23.00, "u" : 2.70, "lt" : 12 },
            24 : { "parent" : 6, "name" : "SilverScreen Black + Solar bronze 6 mm single", "g" : 16.00, "u" : 1.70, "lt" : 3 },
            25 : { "parent" : 6, "name" : "SilverScreen White + Solar bronze 6 mm single", "g" : 16.00, "u" : 1.70, "lt" : 3 }
        };
*/
        
        //-- referenties naar objecten hierin opslaan
        objects = {};
        
        //-- variabelen
        v = {   "gvalue_current"        : 0,
                "gvalue_new"            : 0,
                "uvalue_current"        : 0,
                "uvalue_new"            : 0,
                "ltvalue_current"       : 0,
                "ltvalue_new"           : 0,
                
                "sunm2_current"         : 0,
                "sunm2_new"             : 0,
                "sunall_current"        : 0,
                "sunall_new"            : 0,
                
                "elecsave"              : 0,
                "elecco2_current"       : 0,
                "elecco2_new"           : 0,
                "elecco2save"           : 0,
                
                "aircocosts_current"    : 0,
                "aircocosts_new"        : 0,
                "aircosave"             : 0,
                
                "heatloss_current"      : 0,
                "heatloss_new"          : 0,
                "gasloss_current"       : 0,
                "gasloss_new"           : 0,
                "gassave"               : 0,
                
                "gasco2_current"        : 0,
                "gasco2_new"            : 0,
                "gasco2save"            : 0,
                
                "gascosts_current"      : 0,
                "gascosts_new"          : 0,
                "gascostssave"          : 0,
                
                "totalco2save"          : 0,
                "totalcostssave"        : 0
            }
        
        //-- variabelen met decimaal
        vfixed = new Array( "uvalue_current",
                            "uvalue_new",
                            "ltvalue_current",
                            "ltvalue_new",
                            "sunall_current",
                            "sunall_new",
                            "heatloss_current",
                            "heatloss_new");
        
        //-- currency variabelen 
        vcurr = new Array(  "aircocosts_current",
                            "aircocosts_new",
                            "aircosave",
                            "gascosts_current",
                            "gascosts_new",
                            "gascostssave",
                            "totalcostssave");
        
        //-- alle meuk berekenen \o/
        function calc() {
            
            if (sv("i_currentWindow") != 0 && sv("i_newWindow") != 0) {
            
                //-- gwaarde & uwaarde
                v["gvalue_current"]     = ws_current[sv("i_currentWindow")].g;
                v["gvalue_new"]         = ws_new[sv("i_newWindow")].g;
                v["uvalue_current"]     = i2m_m2(ws_current[sv("i_currentWindow")].u);
                v["uvalue_new"]         = i2m_m2(ws_new[sv("i_newWindow")].u);
                //v["uvalue_current"]     = ws_current[sv("i_currentWindow")].u;
                //v["uvalue_new"]         = ws_new[sv("i_newWindow")].u;
                v["ltvalue_current"]    = ws_current[sv("i_currentWindow")].lt;
                v["ltvalue_new"]        = ws_new[sv("i_newWindow")].lt;
                
                //-- airco
                //v["sunm2_current"]      = i2m_m2(i2m_m2((v["gvalue_current"] / 100) * iv("i_solarRadiation")));
                //v["sunm2_new"]          = i2m_m2(i2m_m2((v["gvalue_new"]     / 100) * iv("i_solarRadiation")));
                v["sunm2_current"]      = (v["gvalue_current"] / 100) * iv("i_solarRadiation");
                v["sunm2_new"]          = (v["gvalue_new"]     / 100) * iv("i_solarRadiation");
                v["sunall_current"]     = ((v["sunm2_current"]  * iv("i_windowSurface")) / 1000);
                v["sunall_new"]         = ((v["sunm2_new"]      * iv("i_windowSurface")) / 1000);
                v["elecsave"]           = ((v["sunall_current"] - v["sunall_new"]) / 2 * iv("i_sunHours") * 365);
                
                v["elecco2_current"]    = m2i_kg(v["sunall_current"] / 2 * iv("i_sunHours") * 365 * 0.63);
                v["elecco2_new"]        = m2i_kg(v["sunall_new"]     / 2 * iv("i_sunHours") * 365 * 0.63);
                v["elecco2save"]        = (v["elecco2_current"] - v["elecco2_new"]);
                
                v["aircocosts_current"] = (v["sunall_current"] / 2 * iv("i_sunHours") * iv("i_elecPrice") * 365);
                v["aircocosts_new"]     = (v["sunall_new"]     / 2 * iv("i_sunHours") * iv("i_elecPrice") * 365);
                v["aircosave"]          = (v["aircocosts_current"] - v["aircocosts_new"]);
                
                //-- verwarming
                tempDiff = i2m_c(iv("i_tempInside")) - i2m_c(iv("i_tempOutside"));
                v["heatloss_current"]   = ((tempDiff > 0) ? (v["uvalue_current"] * iv("i_windowSurface") * tempDiff / 1000) : 0);
                v["heatloss_new"]       = ((tempDiff > 0) ? (v["uvalue_new"]     * iv("i_windowSurface") * tempDiff / 1000) : 0);
                /*
                v["heatloss_current"]   = ((tempDiff > 0) ? (v["uvalue_current"] * i2m_m2(iv("i_windowSurface")) * tempDiff / 1000) : 0);
                v["heatloss_new"]       = ((tempDiff > 0) ? (v["uvalue_new"]     * i2m_m2(iv("i_windowSurface")) * tempDiff / 1000) : 0);
                */
                v["gasloss_current"]    = m2i_m3(v["heatloss_current"] * iv("i_avgHeatLoss") * 3.6 / 0.8 / 33.9 * 365);
                v["gasloss_new"]        = m2i_m3(v["heatloss_new"]     * iv("i_avgHeatLoss") * 3.6 / 0.8 / 33.9 * 365);
                v["gassave"]            = (v["gasloss_current"] - v["gasloss_new"]);
                
                v["gasco2_current"]     = m2i_kg(i2m_m3(v["gasloss_current"]) * 1.77);
                v["gasco2_new"]         = m2i_kg(i2m_m3(v["gasloss_new"]) * 1.77);
                v["gasco2save"]         = (v["gasco2_current"] - v["gasco2_new"]);
                
                v["gascosts_current"]   = (v["gasloss_current"] * iv("i_gasPrice"));
                v["gascosts_new"]       = (v["gasloss_new"]     * iv("i_gasPrice"));
                v["gascostssave"]       = (v["gascosts_current"] - v["gascosts_new"]);
                
                v["totalco2save"]       = (v["elecco2save"] + v["gasco2save"]);
                v["totalcostssave"]     = (v["aircosave"]   + v["gascostssave"]);
                
            } 
            
            if (v["ltvalue_current"] > 6 || v["ltvalue_new"] > 6) {
                o("r_warning").style.display = "";
                if (v["ltvalue_current"] > 6) {
                    o("c_warning_current").innerHTML = "warning:<br />no visual comfort!";
                    o("c_warning_current").className = "warning";
                } else {
                    o("c_warning_current").innerHTML = "";
                    o("c_warning_current").className = "";
                }
                if (v["ltvalue_new"] > 6) {
                    o("c_warning_new").innerHTML = "warning:<br />no visual comfort!";
                    o("c_warning_new").className = "warning";
                } else {
                    o("c_warning_new").innerHTML = "";
                    o("c_warning_new").className = "";
                }
            } else {
                o("r_warning").style.display = "none";
            }
            
            //-- alle cellen vullen
            for (i in v) {
                
                if (in_array(i, vfixed)) {
                    dec = 1;
                } else {
                    dec = 0;
                }
                
                if (in_array(i, vcurr)) {
                    cur = '<span class="currency">' + currency_symbol + "</span> ";
                } else {
                    cur = "";
                }
                
                o('c_' + i).innerHTML = cur + v[i].toFixed(dec);
            }
        }
        


//-- kijken of waarde in array zit
function in_array(_v, _a) {
    for (var i in _a) {
        if (_a[i] == _v) return true;
    }
    return false;
}

//-- numberformat 
if (typeof Number.prototype.toFixed == 'undefined') {
    
    Number.prototype.toFixed = function(n) {
        
        var p = Math.pow(10,n);
        var sFixedNum = (Math.round(this * p) / p).toString();
        var aFixedNum = sFixedNum.split('.');
        if (aFixedNum.length == 1) {
            aFixedNum[1] = '';
        }
        
        var l = aFixedNum[1].length;
        while (l++ < n) {
            aFixedNum[1] += '0';
        }
        
        return aFixedNum.join('.');
    }
}

//-- meuk tonen en verbergen
function toggleDetails(_ids, _obj) {
    
    for (i = 0; i < _ids.length; i++) {
        obj = document.getElementById(_ids[i]);
        obj.style.display = (obj.style.display == 'none') ? '' : 'none';
    }
    
    
    if (/\+/.test(_obj.innerHTML)) {
        _obj.innerHTML = "<strong>details</strong> -";
    } else {
        _obj.innerHTML = "<strong>details</strong> +";
    }
    
    _obj.blur();
}

//-- object returnen
function o(_id) {
    if (!objects[_id]) {
        objects[_id] = document.getElementById(_id);
    } 
    return objects[_id];
}

//-- waarde van een invoerveld
function iv(_id) {
    return document.forms['f_save'].elements[_id].value;
}

//-- waarde uit een dropdown
function sv(_id) {
    s = document.forms['f_save'].elements[_id];
    return s.options[s.selectedIndex].value;
}

//-- waarde uit een dropdown
function st(_id) {
    s = document.forms['f_save'].elements[_id];
    return s.options[s.selectedIndex].text;
}

//-- munteenheid veranderen
function setCurrency() {
    currency_symbol = sv("i_currency");
    
    spans = document.getElementsByTagName('span');
    
    for (var i = 0; i < spans.length; i++) {
        if (spans.item(i).className == 'currency') {
            spans.item(i).removeChild(spans.item(i).firstChild);
            spans.item(i).appendChild(document.createTextNode(currency_symbol));
        }
    }
}

//-- eenheid veranderen
function setUnit() {
    u = sv("unit");
    
    if (u == "metric") {
        is_metric = true;
    } else {
        is_metric = false;
    }

    spans = document.getElementsByTagName('span');
    
    for (var i = 0; i < spans.length; i++) {
        if (spans.item(i).className == 'm2') {
            spans.item(i).removeChild(spans.item(i).firstChild);
            spans.item(i).appendChild(document.createTextNode(m2_symbol[u]));
        }
        if (spans.item(i).className == 'm3') {
            spans.item(i).removeChild(spans.item(i).firstChild);
            spans.item(i).appendChild(document.createTextNode(m3_symbol[u]));
        }
        if (spans.item(i).className == 'c') {
            spans.item(i).removeChild(spans.item(i).firstChild);
            spans.item(i).appendChild(document.createTextNode(c_symbol[u]));
        }
        if (spans.item(i).className == 'kg') {
            spans.item(i).removeChild(spans.item(i).firstChild);
            spans.item(i).appendChild(document.createTextNode(kg_symbol[u]));
        }
    }
}



//-- selectbox met landen
function fillCountry(_obj) {
    
    cont_id = _obj.options[_obj.selectedIndex].value;
    
    count = document.getElementById("country");
    cit   = document.getElementById("city");
    
    count.options.length = 0;
    cit.style.display = 'none';
    setValues(0);
    
    if (cont_id) {
        //-- tonen
        
        count.options[count.options.length] = new Option("Choose...", "");
        for (var i = 1; i < countries[cont_id].length; i++) {
            if (countries[cont_id][i]) {
                count.options[count.options.length] = new Option(countries[cont_id][i], i);
            }
        }
        
        count.style.display = 'block';
        document.getElementById("r_land").style.display = "";
        document.getElementById("r_city").style.display = "none";
        
    } else {
        //-- verbergen
        count.style.display = 'none';
        document.getElementById("r_land").style.display = "none";
        document.getElementById("r_city").style.display = "none";
    }
    
    
}

//-- selectbox met steden vullen
function fillCity(_obj) {
    
    count_id = _obj[_obj.selectedIndex].value;
    city     = document.getElementById("city");
    
    city.options.length = 0;
    setValues(0);
    
    if (count_id) {
        //-- tonen
        
        if (nrOfItems(cities[count_id]) > 1) {
            //-- meerdere steden aanwezig
            city.style.display = 'block';
            document.getElementById("r_city").style.display = "";
            
            city.options[city.options.length] = new Option("Choose...", "");
            
            for (i = 0; i < cities[count_id].length; i++) {
                
                if (typeof cities[count_id][i] == 'object') {
                    city.options[city.options.length] = new Option(cities[count_id][i].name, i);
                }
            }
        } else {
            //-- 1 stad aanwezig
            city.style.display = "none";
            document.getElementById("r_city").style.display = "none";
            
            setValues(cityId(count_id));
        }
        
    } else {
        //-- verbergen
        city.style.display = 'none';
        document.getElementById("r_city").style.display = "none";
    }

}

//-- selectbox met eenheden vullen
function fillUnit(_obj) {
    unit = document.getElementById("unit");
    
    //unit.options.length = 0;
    
    cntry = _obj.options[_obj.selectedIndex].value;
    
    if (units[cntry] == "metric") {
        is_metric = true;
        unit.selectedIndex = 0;
    } else {
        is_metric = false;
        unit.selectedIndex = 1;
    }
    
    setUnit();
}

//-- waardes invullen op basis van city
function setValues(_city) {
    if (_city) {
        //-- vullen
        cobj = document.forms['f_save'].elements['country'];
        cid = cobj.options[cobj.selectedIndex].value;
        document.forms['f_save'].elements['i_tempOutside'].value = cities[cid][_city].temp;
        document.forms['f_save'].elements['i_avgHeatLoss'].value = cities[cid][_city].thermal_loss;
        document.forms['f_save'].elements['i_solarRadiation'].value = cities[cid][_city].insolation;
    } else {
        //-- leegmaken
        document.forms['f_save'].elements['i_tempOutside'].value = 0;
        document.forms['f_save'].elements['i_avgHeatLoss'].value = 0;
        document.forms['f_save'].elements['i_solarRadiation'].value = 0;
    }
}

function setValues2() {
    if (!is_metric) {
        document.forms['f_save'].elements['i_windowSurface'].value  = 1000;
        document.forms['f_save'].elements['i_gasPrice'].value       = 0.0113;
        document.forms['f_save'].elements['i_tempInside'].value     = 68;
        document.forms['f_save'].elements['i_tempOutside'].value    = m2i_c(document.forms['f_save'].elements['i_tempOutside'].value);
      //document.forms['f_save'].elements['i_solarRadiation'].value = parseInt(m2i_m2(document.forms['f_save'].elements['i_solarRadiation'].value));
        document.forms['f_save'].elements['i_solarRadiation'].value = parseInt(i2m_m2(document.forms['f_save'].elements['i_solarRadiation'].value));
    }
}

//-- omrekenen van metric naar imperial
function m2i_m2(_value) {
    if (is_metric) {
        return _value;
    } else {
        return _value * m2i_m2_factor;
    }
}

function m2i_m3(_value) {
    if (is_metric) {
        return _value;
    } else {
        return _value * m2i_m3_factor;
    }
}

function m2i_c(_value) {
    if (is_metric) {
        return _value;
    } else {
        return m2i_c_factor1 + (_value * m2i_c_factor2);
    }
}

function m2i_kg(_value) {
    if (is_metric) {
        return _value;
    } else {
        return _value * m2i_kg_factor;
    }
}

//-- omrekenen van imperial naar metric
function i2m_m2(_value) {
    if (is_metric) {
        return _value;
    } else {
        return _value / m2i_m2_factor;
    }
}

function i2m_m3(_value) {
    if (is_metric) {
        return _value;
    } else {
        return _value / m2i_m3_factor;
    }
}

function i2m_c(_value) {
    if (is_metric) {
        return _value;
    } else {
        return (_value - m2i_c_factor1) / m2i_c_factor2;
    }
}

function i2m_kg(_value) {
    if (is_metric) {
        return _value;
    } else {
        return _value / m2i_kg_factor;
    }
}


//-- waardes omzetten
function recalcUnits() {
    //if (!is_metric) 
}

//-- aantal items in een array
function nrOfItems(_array) {
    var j = 0;
    for (var i = 0; i < _array.length; i++) {
        if (_array[i]) j++;
    }
    return j;
}

//-- city id van land met 1 city returnen
function cityId(_count_id) {
    for (var i = 0; i < cities[_count_id].length; i++) {
        if (cities[_count_id][i]) {
            return i;
        }
    }
}


//-- inhoud van selectbox nieuwe situatie vullen
function changeNew() {
    //alert(sv("i_currentWindow"));
    obj_new = document.forms['f_save'].elements['i_newWindow'];
    obj_new.options.length = 0;
    
    for (var i in ws_new) {
        if (ws_new[i].window_id == ws_current[sv("i_currentWindow")].window_id) {
            // alert(i);
            obj_new.options[obj_new.options.length] = new Option(ws_new[i].name, i);
        }
        /*
        if (ws_new[i].window_id == sv("i_currentWindow")) {
            // alert(i);
            obj_new.options[obj_new.options.length] = new Option(ws_new[i].name, i);
        }
        */
    }
}

//-- naar stap 2
function step2() {
    new Effect.toggle('regional_settings', 'slide', {duration: 0.5, queue: 'bla'}); 
    new Effect.toggle('input_params', 'slide', {delay: 0.5, duration: 0.5, queue: 'bla'});
    
    document.getElementById("to_step_2").style.display = "none";
    
    toggleHelp(169);
    screen_id = 2;
}

function step2_mac() {
    o("regional_settings").style.display    = "none";
    o("input_params").style.display         = "block";
    
    o("step1").className = "checked";
    o("step2").className = "on";
    o("to_step_2").style.display = "none";
    
    toggleHelp(169);
    screen_id = 2;
    setValues2();
}

//-- naar stap 3
function step3() {
    new Effect.toggle('input_params', 'slide', {duration: 0.5, queue: 'bla'});
    new Effect.toggle('energy_savings', 'slide', {delay: 0.5, duration: 0.5, queue: 'bla'});
    
    document.getElementById("to_step_3").style.display = "none";
    
    toggleHelp(169);
    screen_id = 3;
}

function step3_mac() {
    o("input_params").style.display     = "none";
    o("energy_savings").style.display   = "block";
    
    o("step2").className = "checked";
    o("step3").className = "checked";
    o("to_step_3").style.display = "none";
    
    toggleHelp(169);
    screen_id = 3;
}

//-- invoerparameters showen
function toggleParams(_obj) {
    new Effect.toggle('input_params', 'slide');
    
    if (/wijzigen/.test(_obj.innerHTML) || /Edit/.test(_obj.innerHTML)) {
        _obj.innerHTML = 'Hide <strong>inputparameters</strong>';
    } else {
        _obj.innerHTML = 'Edit <strong>inputparameters</strong>';
    }
    
    _obj.blur();
}

function toggleParams_mac(_obj) {
    var s = o("input_params").style.display;
    
    o("input_params").style.display = (s == "none") ? "block" : "none";
    
    toggleHelp(169);
    
    if (/wijzigen/.test(_obj.innerHTML) || /Edit/.test(_obj.innerHTML)) {
        screen_id = 2;
        _obj.innerHTML = 'Hide <strong>inputparameters</strong>';
    } else {
        screen_id = 3;
        _obj.innerHTML = 'Edit <strong>inputparameters</strong>';
    }
    
    // _obj.blur();
}

//-- kijken of je naar de volgende stap mag
function checkStep2() {
    if (iv("i_tempOutside")     == 0 ||
        iv("i_solarRadiation")  == 0 ||
        sv("i_currency")        == "") {
        o("to_step_2").style.display = "none";
    } else {
        o("to_step_2").style.display = "block";
    }
}

//-- return keycode
function getKeycode(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode;
	return charCode;
}

//-- alleen numerieke waardes toestaan
function checkNr(e) {
    e = (e == undefined) ? window.event : e;
    // 8 = backspace, mozilla fix
    // 0 = 48, 9 = 57, . = 46
    var key = getKeycode(e);
    if (key == 8 || (key >= 48 && key <= 57) || key == 46) {
        return true;
    } else {
        return false;
    }
}