Of course, this is very easy to do with jQuery. Use the event window.loadto determine when all images load, then show the content:
HTML
<html>
<body>
<div id="loading"></div>
<div id="container">
<img src="http://www.playirishlottery.co.uk/wp-content/uploads/image-2.jpg"/>
</div>
</body>
</html>
JQuery
$(window).load(function() {
});
function show() {
$('#loading').hide();
$('#container').fadeIn();
};
setTimeout(show, 3000);
setTimeout, . show() .load
Fiddle: http://jsfiddle.net/xM6v9/