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_cookie");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
	}

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

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