/****
change style
www.usetime.net
by:ansonChen
****/
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 styleCookie = readCookie(location.href + "style");   
	var title = styleCookie ? styleCookie : getPreferredStyleSheet();   
	setActiveStyleSheet(title);   
}

window.onunload = function(e) {   
	var title = getActiveStyleSheet();   
	createCookie(location.href + "style", title, 365);   
}   
	var styleCookie = readCookie(location.href + "style");   
	var title = styleCookie ? styleCookie : getPreferredStyleSheet();   
	setActiveStyleSheet(title);  
*/