delay function

delay function

How can I set Timeout on row where is  $("#back") ...
  1. $(document).ready(function(){    
      $("#item").hover(function(){
        $("#back").css({ "background-image":"url('images/asd.jpg')","transition":"background-image  500ms ease-in-out" });
      });  
      $("#item2").hover(function(){
        $("#back").css({ "background-image":"url('images/eee.jpg')","transition":"background-image 500ms ease-in-out" });
      });
      $("#item3").hover(function(){
        $("#back").css({ "background-image":"url('images/rrr.jpg')","transition":"background-image 500ms ease-in-out" });
      });
    });