Implement jQuery element draggable() form Google Ajax Librries API it simple just some lines of code take a look at livedemo.
Google host providing frequently used javascript files eg. jQuery, Mootools, Dojo. Use google.load() to speedup your website loading.

Javascript Code
Contains google ajax api code loading jquery form libraries google.load();
<script src="http://www.google.com/jsapi?key=AB">
</script>
<script type="text/javascript" >
google.load("jquery", "1");
google.load("jqueryui", "1");
function OnLoad(){
$(#content).html(<div id="drag-div" "> +
<div id="dragme"></div></div>);
$("#drag-div").draggable({
"handle": "div"
});
}
google.setOnLoadCallback(OnLoad);
</script>
<body>
<div id="content">Loading...</div>
</body>
CSS Code
#dragme
{
width:229px;
height:129px;
background:url(dragmelogo.png) no-repeat;
border:4px solid #666666
}
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