$(document).ready(function() {

			//Set css in Firefox (Required to use the backgroundPosition js)
			$('#shutter1').css({backgroundPosition: '0px 0px'});
			$('#shutter2').css({backgroundPosition: '0px 0px'});
			$('#shutter3').css({backgroundPosition: '0px 0px'});
			$('#shutter4').css({backgroundPosition: '0px 0px'});

			//Animate the shutter  
			$(".link").hover(function(){
			      $(this).parent().animate({backgroundPosition: '(0px -100px)'}, 500 );
			    }, function() {
			      $(this).parent().animate({backgroundPosition: '(0px 0px)'}, 500 );
			}); 
		 });