$(document).ready(function()
{
  $.each("#portfolio li", function(index, value){
    $(this).hover(function(){
      // hover on
        var feature_img = $(this).attr("rel");
        $("#feature img").hide();
        $("#feature img").load(function()
        {
          $("#feature img").fadeIn();
          }).attr("src", "/images/"+feature_img+".png");
      }, function(){
      // hover off
        //$("#feature img");
    });
  });  
});