$(document).ready(function(){
	$('.page_item a')
		.css( {backgroundPosition: "0 0"} )
		.mouseover(function(){
			$(this).stop().animate({backgroundPosition:'0px -250px'}, {duration:3000})
		})
		.mouseout(function(){
			$(this).stop().animate({backgroundPosition:'0px 0px'}, {duration:3000})
		})
});