/**
* Styleswitcher
* 
* From http://www.alistapart.com/articles/alternate/
*/
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;
}

/**
 * toogleActiveStyleSheet
 * 
 * function to toogle the active stylesheet
 * @author Mads Jørgensen
 */
function toggleActiveStyleSheet() {
	if (currentStyle < currentStyles.length-1) {
		currentStyle++;
	} else {
		currentStyle = 0;
	}
	
	// set style
	setActiveStyleSheet(currentStyles[currentStyle]);
}

var currentStyle = 0;
var currentStyles = new Array();

window.onload = function(e) {
	// get all stylesheets
	var uniqueStyles = new Object();
	var styleTitle;
	for(i=0, j=0; (a = document.getElementsByTagName("link")[i]); i++) {
		styleTitle = a.getAttribute("title");
		if(a.getAttribute("rel").indexOf("style") != -1 && styleTitle != null && styleTitle != "") {
			if (uniqueStyles[styleTitle] == undefined) {
				currentStyles.push(styleTitle);
				
				// is it the active style?
				if (title.toLowerCase() == styleTitle.toLowerCase()) {
					currentStyle = j;
				}
			}
			j++;
		}
	}
}

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

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

// check for style is null
if (typeof(title).toLowerCase() == "string") {
	setActiveStyleSheet(title);
}

/**
 * Function to toggle the visibility of a element
 */
function toggleElementVisibility(element_name) {
	var e = document.getElementById(element_name);
	
	if (typeof(e) != "undefined") {
		if (e.style.visibility == 'visible') {
			
			e.style.visibility = 'hidden';
			e.style.display = 'none';
			
		} else {
			
			e.style.visibility = 'visible';
			e.style.display = 'block';
			
		}
		
	}
}