// Functie om page title aan te passen:
function setPageTitle(title) {
    document.title = "Natuur en Milieu Flevoland :: " + title;
}


// Functies m.b.t. schermresolutie:
function GetCookie(name) {
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen) {
        var j = i + alen;
        if (document.cookie.substring(i, j) == arg)
            return getCookieVal(j);
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    return null;
}

function SetCookie(name, value) {
    var argv = SetCookie.arguments;
    var argc = SetCookie.arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    var path = (argc > 3) ? argv[3] : null;
    var domain = (argc > 4) ? argv[4] : null;
    var secure = (argc > 5) ? argv[5] : false;
    document.cookie = name + "=" + escape(value) +
        ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
        ((path == null) ? "" : ("; path=" + path)) +
        ((domain == null) ? "" : ("; domain=" + domain)) +
        ((secure == true) ? "; secure" : "");
}

function DeleteCookie(name) {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = GetCookie(name);
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

function getCookieVal(offset) {
    var endstr = document.cookie.indexOf(";", offset);
    if (endstr == -1)
        endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}

function checkResolution() {
    var origRes = GetCookie('resolution');
    var res = GetCookie('resolution');
    var defaultRes = "1280";
    var minRes = "1024";
    w = screen.width; // -> gaat mis met 2 monitoren en 1tje op high en de andere op low     
    if (window.innerWidth) {
        w = window.innerWidth;
    }
    else {
        if (!(document.documentElement.clientWidth == 0)) { //strict mode
            w = document.documentElement.clientWidth + 20;
            defaultRes = "1260";
            minRes = "1004";
        }
        else { //quirks mode
            w = document.body.clientWidth;
        }
    }
    //       alert("Screen width: " + w + "/Width in cookie: " + res);
    if (res == null) {//    Geen cookie gezet: zet cookie
        SetCookie('resolution', ((w > 1024) ? 1280 : 1024));
    }
    else {//    Cookie gezet
        if (res != w) {
            //  Update cookie wanneer cookie-waarde ongelijk is aan schermbreedte
            SetCookie('resolution', ((w > 1024) ? 1280 : 1024));
        }
    }
/*
    if (w <= 1024) {
        changeStyleSheet('client_mainstyle_', '1024');
    }
    else {
        changeStyleSheet('client_mainstyle_', '1280');
    }
*/
    if (origRes == 1280 && w <= 1024) {
        location.href = location.href;
    }
    else if (origRes == 1024 && w > 1024) {
        location.href = location.href;
    }
}

function changeStyleSheet(title, layoutsheet) {
    var i, a, main;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
        if (a.getAttribute('href').indexOf(title) != -1) {
            if (a.getAttribute('href').indexOf(layoutsheet) != -1) {
                a.disabled = false;
            }
            else {
                a.disabled = true;
            }
        }
    }
}

// Event Listeners:
if (window.addEventListener) {
    window.addEventListener("load", checkResolution, false);
}
else if (window.attachEvent) {
    window.attachEvent("onload", checkResolution);
}