var expDays = 15;  // How many days to remember the setting
var standardStyle = '4'; // This is the number of your standard style sheet; this will be used when the user did not do anything.
var nameOfCookie = 'switchstyle'; // This is the name of the cookie that is used.  
var urlToCSSDirectory = ''; // This is the URL to your directory where your .css files are placed on your site.  For example: http://www.seniorennet.be/URL_TO_STYLESHEET_DIRECTORY_OF_YOUR_SITE/

// Now you can set here the names of your different .css files; exactly the name as set on your website

var ScreenCSS_4 = 'style_4.css';

/***********************************************************************************************
	
	DO NOT CHANGE ANYTHING UNDER THIS LINE, UNLESS YOU KNOW WHAT YOU ARE DOING
	
***********************************************************************************************/

// This is the main function that does all the work
function switchStyleOfUser(){
	var Style = GetCookie(nameOfCookie);
	if (Style == null) {
		Style = standardStyle;
	}
	
	if (Style == "4") { document.write('<link rel="stylesheet" type"text/css" href="' + urlToCSSDirectory + ScreenCSS_4 + '" media="screen">'); }	

	var Style = "";
	return Style;
}

var exp = new Date(); 
exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

// Function to get the settings of the user
function getCookieVal (offset) {  
	var endstr = document.cookie.indexOf (";", offset);  
	if (endstr == -1)    
	endstr = document.cookie.length;  
	return unescape(document.cookie.substring(offset, endstr));
}
	
// Function to get the settings of the user
function GetCookie (name) {  
	var arg = name + "=";  
	var alen = arg.length;  
	var clen = document.cookie.length;  
	var i = 0;  
	while (i < clen) {    
		var j = i + alen;    
		if (document.cookie.substring(i, j) == arg)      
		return getCookieVal (j);    
		i = document.cookie.indexOf(" ", i) + 1;    
		if (i == 0) break;   
	}  
	return null;
}

// Function to remember the settings
function SetCookie (name, value) {
	var argv = SetCookie.arguments;  
	var argc = SetCookie.arguments.length;  
	var expires = (argc > 2) ? argv[2] : null;  
	var path = (argc > 3) ? argv[3] : null;  
	var domain = (argc > 4) ? argv[4] : null;  
	var secure = (argc > 5) ? argv[5] : false;  
	document.cookie = name + "=" + escape (value) + 
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
	((path == null) ? "" : ("; path=" + path)) +  
	((domain == null) ? "" : ("; domain=" + domain)) +    
	((secure == true) ? "; secure" : "");
}

// Function to remove the settings
function DeleteCookie (name) {  
	var exp = new Date();  
	exp.setTime (exp.getTime() - 1);  
	var cval = GetCookie (name);  
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

// This function is used when the user gives his selection
function doRefresh(){
	location.reload();
}

// This will call the main function.  Do not remove this, because otherwise this script will do nothing...
document.write(switchStyleOfUser());