 { width: 150px; height: 150px; padding: 0.5em; float: left; margin: 10px; }
	#draggable, #draggable-nonvalid { width: 100px; height: 100px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
	</style>
	<script>
	$(function() {
		$( "#draggable, #draggable-nonvalid" ).draggable();
		$( "#droppable" ).droppable({
			accept: "#draggable",
			activeClass: "ui-state-hover",
			hoverClass: "ui-state-active",
			drop: function( event, ui ) {
				$( this )
					.addClass( "ui-state-highlight" )
					.find( "