after i spent 2 day searching a preload function in jQueryi with no succes, i manage to do this:

after i upload the image on server, in a list i get this:

<li id="upimagesDYGONI">
  <div class="percentage">100%</div>
  <div class="uploadifyProgress">
     <div align=" center" class="uploadifyProgressBar" id="upimagesDYGONIProgressBar" style="width: 100%;">
       <!--Progress Bar-->
     </div>
  </div>
</li>

with this function, i preload the image:

$.getlastimage = function(id) {
  $.getJSON('operations.php', {'operation':'getli', 'id':id,}, function(lastimg){
    $("#upimages" + id + " .percentage").text('processing');
    $("#upimages" + id).append('<a href=""><img id="' + id + '" src="" alt="" /></a>')
                       .parent().attr({"href":"uploads/"+ lastimg +'?'+ (new Date()).getTime()});
    $("#"+id).hide().attr({"src":"uploads/"+ lastimg +'?'+ (new Date()).getTime(), "alt":lastimg})
                    .load(function() {
                            $(this).show();
                            $("#upimages" + id + " .percentage").remove();
                            $("#upimages" + id + " .uploadifyProgress").remove();
                        });

    });
  }  

})(jQuery) 

and i get this:

<li id="upimagesLRBHYN" style="" class="">
  <a href="uploads/0002.jpg?1271901177027">
    <img alt="0002.jpg" src="uploads/0002.jpg?1271901177028" id="LRBHYN" style="display: block;">
  </a>
</li>

how i can simplify the function? i want to use the full power of jQuery!! any idea?