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, 365); 
}