var cssChangerPrefix = "alternate_";

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

setActiveStyleSheet(title);

function csstest()
{
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1)
		{
			alert(a.disabled);
			alert(a.getAttribute("title"));
		}
	}
}

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.getAttribute("title").substr(0, cssChangerPrefix.length) == cssChangerPrefix) {
			a.disabled = true;
			if(a.getAttribute("title") == cssChangerPrefix+title) a.disabled = false;
		} else 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.getAttribute("title").substr(0, cssChangerPrefix.length) == cssChangerPrefix
			&& !a.disabled) return a.getAttribute("title").substr(cssChangerPrefix.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")
			&& a.getAttribute("title").substr(0, cssChangerPrefix.length) == cssChangerPrefix)
			return a.getAttribute("title").substr(cssChangerPrefix.length);
	}
	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, 30);
}