$(document).ready(function(){
	$('.top_menu_item')
		.css( {backgroundPosition: "0 0"} )
		.mouseover(function(){
			$(this).stop().animate(
				{backgroundPosition:"(0 -32px)"}, 
				{duration:300})
			})
		.mouseout(function(){
			$(this).stop().animate(
				{backgroundPosition:"(0 0)"}, 
				{duration:300})
		}
	);
	$('.left_menu_item_inactive')
		.css( {backgroundPosition: "0px -2px"} )
		.mouseover(function(){
			$(this).stop().animate(
				{backgroundPosition:"(7px -2px)"}, 
				{duration:100})
			})
		.mouseout(function(){
			$(this).stop().animate(
				{backgroundPosition:"(0px -2px)"}, 
				{duration:100})
		}
	);
});

/**
 * @author Alexander Farkas
 * v. 1.02
 */
(function($) {
$.extend($.fx.step,{
backgroundPosition: function(fx) {
if (fx.state === 0 && typeof fx.end == 'string') {
var start = $.curCSS(fx.elem,'backgroundPosition');
start = toArray(start);
fx.start = [start[0],start[2]];
var end = toArray(fx.end);
fx.end = [end[0],end[2]];
fx.unit = [end[1],end[3]];
}
var nowPosX = [];
nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];
function toArray(strg){
strg = strg.replace(/left|top/g,'0px');
strg = strg.replace(/right|bottom/g,'100%');
strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
}
}
});
})(jQuery);