//------------------------------------------------------------------------------
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 createStyleSheetCookie(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 readStyleSheetCookie(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 = readStyleSheetCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
}
//------------------------------------------------------------------------------
window.onunload = function(e){
	var title = getActiveStyleSheet();
	createStyleSheetCookie("style", title, 365);
}
//------------------------------------------------------------------------------
var cookie = readStyleSheetCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
//------------------------------------------------------------------------------