//
// Please don't change anything in this file
//
//

// Read a page's GET URL variables and return them as an associative array.
function getUrlVars()
{
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');

    for(var i = 0; i < hashes.length; i++)
    {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = hash[1];
    }
    return vars;
}

function setCookie(c_name,value,expiredays)
{
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function getCookie(c_name)
{
	if (document.cookie.length>0)
	{
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1)
		{ 
			c_start=c_start + c_name.length+1; 
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		} 
	}
	return "";
}

if (typeof(cookie_name) == 'undefined')
{
    cookie_name = "unlevel";
}

var unLevel = 0;
var today = new Date();
var cookie_value = getCookie(cookie_name);

if (cookie_value == "")
{
	cookie_value = today.toLocaleDateString();
	unLevel = 2; // NEW
}
else
{
	cookie_date = new Date(cookie_value);
	if((today.getTime()*1000) - (cookie_date.getTime()*1000) < 86400 )
	{
		unLevel = 1; // UN
	}
	else
	{
		unLevel = 0; // GN
	}
}

setCookie(cookie_name, today.toLocaleDateString(), 365);

if (document.forms[0].p && typeof(promo_id) == 'undefined')
{
	promo_id = document.forms[0].p.value;
}

if (document.forms[0].t && typeof(catalog_id) == 'undefined')
{
	catalog_id = document.forms[0].t.value;
}

if (document.forms[0].a && typeof(promo_area) == 'undefined')
{
	promo_area = document.forms[0].a.value;
}

if (document.forms[0].c && typeof(promo_creative) == 'undefined')
{
	promo_creative = document.forms[0].c.value;
}

var url = "http://www.theuseful.com/external_click?unlevel=" + unLevel;

if (promo_id != '')
{
	url += "&p=" + promo_id;
}

if (catalog_id != '')
{
	url += "&t=" + catalog_id;
}

if (promo_area != '')
{
	url += "&a=" + promo_area;
}
else
{
	urlvars = getUrlVars();

	if(urlvars['a'] != '')
	{
		url += "&a=" + urlvars['a'];
	}
}

if (promo_creative != '')
{
	url += "&c=" + promo_creative;
}

var pixel = new Image();
pixel.height = 1;
pixel.width = 1;
pixel.src = url;