function callstat() {
document.write('<img border="0" height="1" width="1" src="http://www.pixelracer.com/stats/?siteid=idnumber&' + stats +'">');
}

function enter() {
stats = "referrer=" + escape(window.document.referrer);
stats += "&agent=" + escape(navigator.userAgent);
stats += "&history=" + escape(history.length);
stats += "&res=" + escape(screen.width) + "x" +  escape(screen.height);
stats += "&appname=" + escape(navigator.appName);
}

function leave() {
enter();
stats += "&leaving=true";
callstat();
}

enter();
callstat();