$(function() {
					 $('#navRoll img').animate({"opacity": .5 });  //first event to set opacity to 50%

					 $('#navRoll img').hover(function() {
															$(this).stop().animate({ "opacity": 1 }); //reset to 100%
													 	  }, function() {
																   		  $(this).stop().animate({ "opacity": .5 });
																   		}
											);
        });