Jquery UI drag and drop counter

gistfile1.js

$(function() {
        $( "#drag-me" ).draggable();
    
        $( "#drop" ).droppable({
            drop: function( event, ui ) {
                $( this )
                    .addClass( "ui-state-highlight" )
                    .find( "p" )
                    $('#counter').html(function(i, val) {
                    return val * 1 + 1
                  });
              }
        });
    });​

//http://jsfiddle.net/hRznb/