pageOpen = new Date();
var url = document.location;

if (document.referrer && document.referrer!=""){
	var donde = document.referrer;	
}
document.write("<iframe src='tracker.php?p="+url+"&r="+donde+"' width='1' height='1' id='tracker' style='visibility:hidden'></iframe>");


function salida()
{	
    pageClose = new Date();
    
    hours    = (pageClose.getHours() - pageOpen.getHours());
    minutes = (pageClose.getMinutes() - pageOpen.getMinutes());
    seconds = (pageClose.getSeconds() - pageOpen.getSeconds());
    time = (seconds + (minutes * 60) + (hours * 60 * 60));  	
	document.getElementById("tracker").src = "tracker.php?t="+time;
}