JavaScript - Need Help With Capturing Referring Url With Cookie

function myFunction() {
  return {
    a : 'foo',
    b : 'bar',
    c : 'baz',
    d : this.a
  }
}

function getCookie(c_name)
{
var i,x,y,ARRcookies=document.cookie.split(";");
for (i=0;i<ARRcookies.length;i++)
  {
  x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
  y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
  x=x.replace(/^\s+|\s+$/g,"");
  if (x==c_name)
    {
    return unescape(y);
    }
  }
}

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

function checkCookie(username)
{
var username=getCookie("username");
if (username!=null && username!="")
  {
  document.getElementById("feedback").innerHTML = " last time you scored " + username);
  setCookie("username",username,365);
  }
  
else 
  {
    if (username=null || username="")
    {
    setCookie("username",username,365);
    }
  }
}

       /* 
        * COOKIE FUNCTIONS
        */
       
        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);
        }
        
        /* 
         * END COOKIE FUNCTIONS

<script>
num_days = 24;
function ged(noDays){
    var today = new Date();
    var expr = new Date(today.getTime() + noDays*60*60*1000);
    return  expr.toGMTString();
}

function readCookie(cookieName){
    var start = document.cookie.indexOf(cookieName);
    if (start == -1){ 
        document.cookie = "seenit=yes; expires=" + ged(num_days);
    } else {
        window.location = go_to;
    }
}

var go_to = "/index.php?module=article&id=310";

readCookie("seenit");
</script>

<?PHP
if( isset( $_COOKIE['noads139'] ) )
{

}
else
{
	?>
<script type="text/javascript">
function as_click () {
	myDate = new Date();
   myDate.setTime(myDate.getTime()+(1*24*60*60*1000));
   document.cookie = 'noads139=noads139; expires=' + myDate.toGMTString()+"; path=/"
}

// incredibly funky onload add-event scripting, for all browsers

		 if(typeof window.addEventListener != 'undefined')
		 {
		 	//.. gecko, safari, konqueror and standard
		 	window.addEventListener('load', adsense_init, false);
		 }
		 else if(typeof document.addEventListener != 'undefined')
		 {
		 	//.. opera 7
		 	document.addEventListener('load', adsense_init, false);
		 }
		 else if(typeof window.attachEvent != 'undefined')
		 {
		 	//.. win/ie
		 	window.attachEvent('onload', adsense_init);
		 }

		 //** remove this condition to degrade older browsers
		 else
		 {
		 	//.. mobile safari, mac/ie5 and anything else that gets this far

		 	//if there's an existing onload function
		 	if(typeof window.onload == 'function')
		 	{
		 		//store it
		 		var existing = onload;

		 		//add new onload handler
		 		window.onload = function()
		 		{
		 			//call existing onload function
		 			existing();

		 			//call adsense_init onload function
		 			adsense_init();
		 		};
		 	}
		 	else
		 	{
		 		//setup onload function
		 		window.onload = adsense_init;
		 	}
		 }
function adsense_init () {

	if (document.all) {  //ie

		var el = document.getElementsByTagName("iframe");
	
		for(var i = 0; i < el.length; i++) {
			if(el[i].src.indexOf('googlesyndication.com') > -1) {

				el[i].onfocus =  as_click;
			}
		}
	
	} else {   // firefox
	
		window.addEventListener('beforeunload', doPageExit, false);
		window.addEventListener('mousemove', getMouse, true);
	
	}
		
}

//for firefox
var px;
var py;

function getMouse(e) {
	px=e.pageX;
	py=e.pageY;
}

function findY(obj) {
	var y = 0;
	while (obj) {
		y += obj.offsetTop;
		obj = obj.offsetParent;
	}
	return(y);
}

function findX(obj) {
	var x = 0;
	while (obj) {
		x += obj.offsetLeft;
		obj = obj.offsetParent;
	}
	return(x);
}

function doPageExit(e) {

	ad = document.getElementsByTagName("iframe");
	for (i=0; i<ad.length; i++) {
		var adLeft = findX(ad[i]);
		var adTop = findY(ad[i]);
		var inFrameX = (px > (adLeft - 10) && px < (parseInt(adLeft) + parseInt(ad[i].width) + 15));
		var inFrameY = (py > (adTop - 10) && py < (parseInt(adTop) + parseInt(ad[i].height) + 10));
		
		if (inFrameY && inFrameX) {

			myDate = new Date();
            myDate.setTime(myDate.getTime()+(1*24*60*60*1000));
            document.cookie = 'noads139=noads139; expires=' + myDate.toGMTString()+"; path=/"
		
		}
	}

}

//end for firefox
</script>
<?PHP
}
?>
<div id="adsense" style="display: none">
<script type="text/javascript"><!--
google_ad_client = "pub-xxxxxxxxxxxxxxx";
/* 728x90, created 4/15/10 */
google_ad_slot = "xxxxxxxxxxxxxx";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</div>

<script type="text/javascript">
if (document.cookie.indexOf('noads139') < 0)
{
document.getElementById('adsense').style.display = '';
}
else {

}
</script>
<script type="text/javascript">
if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i)) || (navigator.userAgent.match(/iPad/i)))
{
document.getElementById('adsense').style.display = 'none';
}
else {
	
}
</script>