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 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;
}

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;
}



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, 1);
}