// help function to get the site id

function getID() {
	var id = document.location.pathname;
	var i=0;
	for(i=id.length - 1; i>0; i--) {
		if(id[i]=='/')
		break;
	}
	//alert(id);
	id = replace(id.substring(0,i+1),"extensions/","");
	id = replace(id, "themes/", "");
	id = replace(id, "downloads/", "");
	return "style-" + id;
}

function replace(string,text,by) {
	// Replaces text with by in string
	var strLength = string.length, txtLength = text.length;
	if ((strLength == 0) || (txtLength == 0)) return string;
	
	var i = string.indexOf(text);
	if ((!i) && (text != string.substring(0,txtLength))) return string;
	if (i == -1) return string;
	
	var newstr = string.substring(0,i) + by;
	
	if (i+txtLength < strLength)
	newstr += replace(string.substring(i+txtLength,strLength),text,by);
	
	return newstr;
}


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;
				a.disabled = true;
				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(siteid);
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
}

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

var cookie = readCookie(siteid);
var title = cookie ? cookie : getPreferredStyleSheet();
var siteid = getID();
setActiveStyleSheet(title);