function init_drag_drop(){
	$(".giItemCell")
		.find(".giThumbnail")
		.disableSelection()
		.draggable({helper: 'clone'});
	$('#droppable')
		.droppable({
			accept: ".giThumbnail",
			activeClass: 'droppable-active',
			hoverClass: 'droppable-hover',
			drop: function(ev, ui) {
				var clone = ui.draggable.clone();
				var src = clone.attr("src");
				var itemId = clone.prevObject.parent().attr("id"); 
				add_item_on_drop(clone,itemId,src);
			}
		})
		.parent()
		.show(200);
}