<script type="text/javascript">
  $(document).ready(function() {
doReady();

var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(function(s, e) {
    doReady();
});
});

function doReady() {
$('.drag').draggable({ revert: true,helper: 'clone' });}
$('.drop').droppable({
tolerance: touch,
drop: function() { alert('dropped'); }
});
</script>

tolerance: "touch",

$(document).ready(function() {

     doReady();

     var prm = Sys.WebForms.PageRequestManager.getInstance();
     prm.add_endRequest(function(s, e) {
         doReady();
     });

  }); // End of document ready

  function doReady() {

    $('.drag').draggable({ revert: true,helper: 'clone' });

  } // End of do ready

  $('.drop').droppable({
     tolerance: "touch", // Here should be a string
     drop: function() { alert('dropped'); }
  });

function doReady() {

   $('.drag').draggable({ revert: true,helper: 'clone' });
   $('.drop').droppable({
      tolerance: "touch", // Here should be a string
      drop: function() { alert('dropped'); }
   });

 } // End of do ready