function setActiveStyleSheet(title) 
{  
	var i, a, main;   
	if (title) 
		{   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");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
}
 
window.onunload = function(e) {
    var title = getActiveStyleSheet();
    createCookie("style", title, 365);
}
 
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);