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 cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
	
	// set bboard scroll position (ie only)
	var bbscroll;
	if (document.all && document.all["css_scroller"]) {
		bbscroll = readCookie("bbscroll");
		document.all["css_scroller"].scrollTop = bbscroll;
	}
}

window.onunload = function(e) {
	var title = getActiveStyleSheet();
	createCookie("style", title, 365);
	
	// save bboard scroll position (ie only)
	//saveScrollerPosition();
}

function resetScrollerPosition() {
	createCookie("bbscroll", 0, 1);
}

function saveScrollerPosition() {
	// save bboard scroll position (ie only)
	var bbscroll;
	if (document.all && document.all["css_scroller"]) {
		bbscroll = document.all["css_scroller"].scrollTop;
		createCookie("bbscroll", bbscroll, 1);
	}
}

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