SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div>
Test, hover here, move out quickly and the onload won't fire.
</div>

CSS

div { border: solid 1px #ddd; }

JavaScript

var imggg
$("div").hover(function(){
    imggg = new Image(140,100);             
    imggg.onload = function(){ $(document.body).append(this); };
    imggg.src = "http://dummyimage.com/600x400/000/fff?v=" + new Date().getTime();

},function(){
    imggg.onload = null;
});