var objLinkIdSizeUp, objLinkIdSizeDown;

function fontSizeUp() {
	getLinkElements();
	var active = getActiveStyleSheet();
	switch (active) {
		case 'A--' :
			if (objLinkIdSizeDown) objLinkIdSizeDown.disabled = false;
			setActiveStyleSheet('A-');
			break;
		case 'A-' : 
			setActiveStyleSheet('A');
			break;
		case 'A' : 
			setActiveStyleSheet('A+');
			break;
		case 'A+' :
			if (objLinkIdSizeUp) objLinkIdSizeUp.disabled = true;
			setActiveStyleSheet('A++');
			break;
		case 'A++' :			
			break;
		default :
			setActiveStyleSheet('A');
			break;
	}
}

function fontSizeDown(strId) {
  	var active = getActiveStyleSheet();
	getLinkElements();
	switch (active) {
		case 'A++' :
			if (objLinkIdSizeUp) objLinkIdSizeUp.disabled = false;
			setActiveStyleSheet('A+');
			break;
		case 'A+' : 
			setActiveStyleSheet('A');
			break;
		case 'A' : 
			setActiveStyleSheet('A-');
			break;
		case 'A-' :
			if (objLinkIdSizeDown) objLinkIdSizeDown.disabled = true;
			setActiveStyleSheet('A--');
			break;
		case 'A--' :
			break;
		default :
			setActiveStyleSheet('A--');
			break;
	}
}

function getLinkElements() {
	if (document.getElementById("lnkFontSizeUp")) objLinkIdSizeUp = document.getElementById("lnkFontSizeUp");
	if (document.getElementById("lnkFontSizeDown")) objLinkIdSizeDown = document.getElementById("lnkFontSizeDown");
}

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;
		}
	}
	//document.write('<link rel="stylesheet" type="text/css" href="'+ title +'" />');
}

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() {
	return ('A-');
}

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 initStyleSheetSwitcher(e) {
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
}

addLoadEvent(initStyleSheetSwitcher);	// run initLightbox onLoad

window.onunload = function(e) {
	var title = getActiveStyleSheet();
	createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
if (title == 'null') {
  title = getPreferredStyleSheet();
}

setActiveStyleSheet(title);
/*setActiveStyleSheet('A');*/