function setActiveStyleSheet(title)
{
    var i, a, main;
    for (i=0; a = document.getElementsByTagName("link")[i]; i++) {
        if ((a.getAttribute("rel").indexOf("style") != -1) &&
					a.getAttribute("title")) {
	    a.disabled = true;
	    if (a.getAttribute("title") == title) {
		a.disabled = false;
	    }
	}
    }
}

function getActiveStyleSheet()
{
    var i, a;
    for (i=0; a = document.getElementsByTagName("link")[i]; i++) {
	if ((a.getAttribute("rel").indexOf("style") != -1) &&
			 a.getAttribute("title") && !a.disabled) {
	    return a.getAttribute("title");
	}
    }
    return null;
}

function getPreferredStyleSheet()
{
    var i, a;
    for (i=0; a = document.getElementsByTagName("link")[i]; i++) {
	if ((a.getAttribute("rel").indexOf("style") != -1) &&
			(a.getAttribute("rel").indexOf("alt") == -1) &&
			a.getAttribute("title")) {
	    return a.getAttribute("title");
        }
    }
    return null;
}

function createCookie(name,value,days)
{
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
	var expires = "; expires="+date.toGMTString();
    } else {
	expires = "";
    }
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i=0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') {
	    c = c.substring(1,c.length);
	}
        if (c.indexOf(nameEQ) == 0) {
	    return c.substring(nameEQ.length,c.length);
	}
    }
    return null;
}

window.onload = function(e)
{
    var cookie = readCookie("style");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
}

window.onunload = function(e)
{
    var title = getActiveStyleSheet();
    createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

function openChat()
{
    window.open('http://forum.posttraumatischedystrofie.nl/123flashchat.php',
			'Chat', 'height=476,resizable=yes,width=634');
}