$(function () {
    $('#a a')
		.css({ backgroundPosition: "-20px 35px" })
		.mouseover(function () {
		    $(this).stop().animate({ backgroundPosition: "(-20px 94px)" }, { duration: 500 })
		})
		.mouseout(function () {
		    $(this).stop().animate({ backgroundPosition: "(-20px 35px)" }, { duration: 200, complete: function () {
		        $(this).css({ backgroundPosition: "-20px 35px" })
		    }
		    })
		})

});