$(document).ready(function()
{
	$('#list_menu a')
		.css( {backgroundPosition: "0 0"} )
		.mouseover(function(){
			$(this).stop().animate({backgroundPosition:"-675 0"}, {duration:500})
		})
		.mouseout(function(){
			$(this).stop().animate({backgroundPosition:"0 0"}, {duration:500})
		})
});