/**
 * @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);

	
	$(function() {
		$("#menu ul a.home span").css({backgroundPosition: '0 -53px'});
		$("#menu ul a.home span").hover(function () {
			$(this).stop().animate({backgroundPosition: '(0 -145px)'}, 250);
		},
		function () {
			$(this).stop().animate({backgroundPosition: '(0 -53px)'}, 250);
		});
		
		$("#menu ul a.about span").css({backgroundPosition: '-97px -53px'});
		$("#menu ul a.about span").hover(function () {
			$(this).stop().animate({backgroundPosition: '(-97px -145px)'}, 250);
		},
		function () {
			$(this).stop().animate({backgroundPosition: '(-97px -53px)'}, 250);
		});
		
		$("#menu ul a.current span").css({backgroundPosition: '-229px -53px'});
		$("#menu ul a.current span").hover(function () {
			$(this).stop().animate({backgroundPosition: '(-229px -145px)'}, 250);
		},
		function () {
			$(this).stop().animate({backgroundPosition: '(-229px -53px)'}, 250);
		});
		
		$("#menu ul a.class span").css({backgroundPosition: '-401px -53px'});
		$("#menu ul a.class span").hover(function () {
			$(this).stop().animate({backgroundPosition: '(-401px -145px)'}, 250);
		},
		function () {
			$(this).stop().animate({backgroundPosition: '(-401px -53px)'}, 250);
		});
		
		$("#menu ul a.testimonials span").css({backgroundPosition: '-565px -53px'});
		$("#menu ul a.testimonials span").hover(function () {
			$(this).stop().animate({backgroundPosition: '(-565px -145px)'}, 250);
		},
		function () {
			$(this).stop().animate({backgroundPosition: '(-565px -53px)'}, 250);
		});
		
		$("#menu ul a.contact span").css({backgroundPosition: '-735px -53px'});
		$("#menu ul a.contact span").hover(function () {
			$(this).stop().animate({backgroundPosition: '(-735px -145px)'}, 250);
		},
		function () {
			$(this).stop().animate({backgroundPosition: '(-735px -53px)'}, 250);
		});
	});