var __isIE = navigator.appVersion.match(/MSIE/);
var __userAgent = navigator.userAgent;
var __isFireFox = __userAgent.match(/firefox/i);
var __isFireFoxOld = __isFireFox && (__userAgent.match(/firefox\/2./i) || __userAgent.match(/firefox\/1./i));
var __isFireFoxNew = __isFireFox && !__isFireFoxOld;
var __appName = navigator.appName;

function __parseBorderWidth(width) {
    var res = 0;
    if (typeof (width) == "string" && width != null && width != "") {
        var p = width.indexOf("px");
        if (p >= 0) {
            res = parseInt(width.substring(0, p));
        }
        else {
            //do not know how to calculate other values (such as 0.5em or 0.1cm) correctly now
            //so just set the width to 1 pixel
            res = 1;
        }
    }
    return res;
}

//returns border width for some element
function __getBorderWidth(element) {
    var res = new Object();
    res.left = 0; res.top = 0; res.right = 0; res.bottom = 0;
    if (window.getComputedStyle) {
        //for Firefox
        var elStyle = window.getComputedStyle(element, null);
        res.left = parseInt(elStyle.borderLeftWidth.slice(0, -2));
        res.top = parseInt(elStyle.borderTopWidth.slice(0, -2));
        res.right = parseInt(elStyle.borderRightWidth.slice(0, -2));
        res.bottom = parseInt(elStyle.borderBottomWidth.slice(0, -2));
    }
    else {
        //for other browsers
        res.left = __parseBorderWidth(element.style.borderLeftWidth);
        res.top = __parseBorderWidth(element.style.borderTopWidth);
        res.right = __parseBorderWidth(element.style.borderRightWidth);
        res.bottom = __parseBorderWidth(element.style.borderBottomWidth);
    }

    return res;
}

//returns absolute position of some element within document
function getAbsolutePos(element) {
    var res = new Object();
    res.x = 0; res.y = 0;
    if (element !== null) {
        res.x = element.offsetLeft;
        res.y = element.offsetTop;

        var offsetParent = element.offsetParent;
        var parentNode = element.parentNode;
        var borderWidth = null;

        while (offsetParent != null) {
            res.x += offsetParent.offsetLeft;
            res.y += offsetParent.offsetTop;

            var parentTagName = offsetParent.tagName.toLowerCase();

            if ((__isIE && parentTagName != "table") || (__isFireFoxNew && parentTagName == "td")) {
                borderWidth = __getBorderWidth(offsetParent);
                res.x += borderWidth.left;
                res.y += borderWidth.top;
            }

            if (offsetParent != document.body && offsetParent != document.documentElement) {
                res.x -= offsetParent.scrollLeft;
                res.y -= offsetParent.scrollTop;
            }

            //next lines are necessary to support FireFox problem with offsetParent
            if (!__isIE) {
                while (offsetParent != parentNode && parentNode !== null) {
                    res.x -= parentNode.scrollLeft;
                    res.y -= parentNode.scrollTop;

                    if (__isFireFoxOld) {
                        borderWidth = _getBorderWidth(parentNode);
                        res.x += borderWidth.left;
                        res.y += borderWidth.top;
                    }
                    parentNode = parentNode.parentNode;
                }
            }

            //corrigeren voor chrome
            if (__appName == "Netscape") {
                //res.x += 2;
                //res.y += 5;
            }

            parentNode = offsetParent.parentNode;
            offsetParent = offsetParent.offsetParent;
        }
    }
    return res;
}

function getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}