window.onload = function () {

var i = 0,
max = 0,
o = null,

// list of stuff to preload
preload = [
'http://tools.w3clubs.com/pagr2/<?php echo $id; ?>.sleep.expires.png',
'http://tools.w3clubs.com/pagr2/<?php echo $id; ?>.sleep.expires.js',
'http://tools.w3clubs.com/pagr2/<?php echo $id; ?>.sleep.expires.css'
],
isIE = navigator.appName.indexOf('Microsoft') === 0;

for (i = 0, max = preload.length; i < max; i += 1) {

if (isIE) {
new Image().src = preload[i];
continue;
}
o = document.createElement('object');
o.data = preload[i];

// IE stuff, otherwise 0x0 is OK
//o.width = 1;
//o.height = 1;
//o.style.visibility = "hidden";
//o.type = "text/plain"; // IE
o.width = 0;
o.height = 0;

// only FF appends to the head
// all others require body
document.body.appendChild(o);
}
};