<div id="map"></div>

$('#makeMeDraggable').draggable();

<div id="map">
<!--Sample Box using jQuery UI-->
<div id="makeMeDraggable"></div>
</div>

#map{ position:absolute; z-index:1;}
#makeMeDraggable{z-index:2;}

<div id="map"></div>

<div id="makeMeDraggable"></div>