var query = location.search.substring(1); // gets rid of "?"
	var pairs = query.split('&');                           
	var id = ''
	var args = new Object();                                
	for (var p = 0; p < pairs.length; p++) {                
		var field = pairs[p].split('=');                      
		args[unescape(field[0])] = unescape(field[1]);        
		if (field[0] = 'id') {
			id = field[1]
	        }
	}

//set a session cookie

SetCookie('referrer',id,30);

function SetCookie(cookieName,cookieValue,nDays) {
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString();
}