/**
 * Stylesheet toggle variation on styleswitch stylesheet switcher. Built on
 * jQuery. Under an CC Attribution, Share Alike License. By Kelvin Luck (
 * http://www.kelvinluck.com/ )
 */

(function($) {
	// Local vars for toggle
	var availableStylesheets = [];
	var activeStylesheetIndex = 0;

	// To loop through available stylesheets
	$.stylesheetToggle = function() {
		activeStylesheetIndex++;
		activeStylesheetIndex %= availableStylesheets.length;
		$.stylesheetSwitch(availableStylesheets[activeStylesheetIndex]);
	};

	// To switch to a specific named stylesheet
	$.stylesheetSwitch = function(styleName) {
		$('link[@rel*=style][title]').each(
				function(i) {
					this.disabled = true;
					if (this.getAttribute('title') == styleName) {
						this.disabled = false;
						activeStylesheetIndex = i;
					}
				});
		createCookie('style', styleName, 365);
	};

	// To initialise the stylesheet with it's
	$.stylesheetInit = function() {
		$('link[rel*=style][title]').each(function(i) {
			availableStylesheets.push(this.getAttribute('title'));
		});
		var c = readCookie('style');
		if (!c)
			c = "layout";
		if (c) {
			$.stylesheetSwitch(c);
		}
	};
})(jQuery);

// cookie functions http://www.quirksmode.org/js/cookies.html
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
		var 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 eraseCookie(name) {
	createCookie(name, "", -1);
}
// /cookie functions