(function (window) {
	"use strict";
	var thisEvent, thisFunction;
	thisEvent = (window.addEventListener) ? "load" : "onload";
	thisFunction = (GWD_Styleswitcher);
	if (window.addEventListener) {
		window.addEventListener(thisEvent, thisFunction, false);
	} else if (window.attachEvent) {
		window.attachEvent(thisEvent, thisFunction);
	}
}(window));

function GWD_Styleswitcher(style) {
	var Styleswitcher = {
		cookie : null,
		title : null,
		init : function() {
			window.styleTemp = new StyleswitcherSettings("none", "none", "none");
			this.cookie = this.readCookie("style");
			this.title = this.cookie ? this.cookie : this.getPreferredStyleSheet();
			styleTemp.save = this.title;
			styleTemp.use = this.title;
			styleTemp.current = this.title;
			this.setActiveStyleSheet(this.title);
		},
		readCookie : function(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;
		},
		getPreferredStyleSheet : function() {
			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;
		},
		setActiveStyleSheet : function(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;
				}
			}
			styleTemp.current = this.getActiveStyleSheet();
		},
		getActiveStyleSheet : function() {
			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;
		},
		createCookie : function(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=/";
		}
	};
	if (typeof style === "string") {
		switch (style) {
		case "use":
			styleTemp.use = styleTemp.current;
			break;
		case "save":
			styleTemp.use = styleTemp.current;
			styleTemp.save = styleTemp.current;
			Styleswitcher.createCookie("style", styleTemp.save, 365);
			break;
		case "cancel":
			if (styleTemp.current !== styleTemp.use) {
				Styleswitcher.setActiveStyleSheet(styleTemp.use);
			}
			break;
		default:
			Styleswitcher.setActiveStyleSheet(style);
			break;
		}
	} else {
		Styleswitcher.init();
	}
}

function StyleswitcherSettings (saved, in_use, changed) {
	this.save = saved;
	this.use = in_use;
	this.current = changed;
}