//
// Some modifcation to setActiveStyleSheet for:
// Image -> alt replacement for text only
// Cufon
// - Jon (14/12/2010)
// 25/03/2011 - Added imgFlag to stop repeated action
//

var imgs;
var imgFlag;
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;
		}	
	}
	if (title === 'text-only' && imgFlag !==true){
		if(imgs !== 'empty'){
			imgs = document.getElementsByTagName('img');
			for (var x=0; x < imgs.length; x++){
				var context = imgs[x].parentNode;
				var em = document.createElement('em');
				var para = document.createElement('p');
				var text = document.createTextNode(imgs[x].getAttribute('alt'));
				para.setAttribute('class', 'imgaltreplacement');
				para.appendChild(em);
				em.appendChild(text);
				context.insertBefore(para, imgs[x]);
			}
			imgFlag=true;
		}
	} else if (title !== 'text-only' && imgFlag === true) {
		for (var x=0; x < imgs.length; x++){
			var context = imgs[x].parentNode;
			if(!imgs[x].previousSibling.length){
				var targetNode = imgs[x].previousSibling;
				targetNode.getAttribute('class') == 'imgaltreplacement' ? context.removeChild(targetNode) : null;
			}
		}
		imgFlag=false;
	}
	//Cufon && Cufon.refresh();
}

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();
	imgFlag = false;
	setActiveStyleSheet(title);
}

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

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