/*
 * Date:			26.08.2007
 *
 * File:			js/styleswitcher.js
 * Project:			AJAX_CHAT
 *
 * Author:			Sebastian Tschan
 * Website:			https://blueimp.net
 *
 * Original Author:	Paul Sowden
 * Website:			http://www.alistapart.com/stories/alternate/
 * 
 */

// Functionality to switch and persist styles

function setActiveStyleSheet(title) {
	var i, a, main;
	var titleFound = false;
	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;
                titleFound = true;
			}
		}
	}
	if(!titleFound && title != null)
	   setActiveStyleSheet(getPreferredStyleSheet());
}

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;
}