jquery - changing source of clone

I am new to jquery and I have created a drag-and drop function that copies small images from one area to antoher and also mkaes an insert in a database table. All is fine except for one detail that I cannot figure out.
I have two versions of each image (and the images represent data in the database), one thumb version (60 x 60 px)and one larger (140 x 140 px).

In the draggable area there are small images and in the droppable large ones. I want the image to change frpm small to large when i append them without doing a page reload.

I can either use the same image and change width and height or use two different image files. It doesn't matter, what ever is easiest to handle

Any ideas?

//Drag and drop from minlista to program part
	$(function() {	
		$("#minlista .thumb").draggable({
			helper: 'clone',
			opacity: 0.6, 
			cursor: 'move'
		});

		$("#exclist_open").droppable({
		   tolerance: 'touch',   
		   accept: '#minlista .thumb',
		   drop: function(ev, ui){
			  var id =  ui.draggable.find("img").attr("id");
			  var pp_id = $(this).find("div").attr("id");
			  var add_exc = '&exc_id=' + id + '&program_part_id='+ pp_id +'&action=addExcToPart';
			  //window.location.reload(true);
			  $.post("updateDB.php", add_exc); 
			  $(this).append($(ui.draggable).clone());
		   } 
		});
	});

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