Problem with Clone()

Problem with Clone()

Hey JPeople,
      I am trying to clone an <img> when i hover a mouse over it..code goes like this..
        function onHover(sender)
      {
        var targetObj = $("#"+sender.id).clone();
        $("#"+targetObj.id).width = "550";   // targetObj.id is undefined.
      }      
 
      Now the problem is that  i am getting the above message when i debug the application...Can anyone help me out.....It seems that JQuery cannot get the id somehow....