$(document).ready(function()
{
	slide("#sliding-navigation", 25, 0, 150, .8);
});

function slide(navigation_id, pad_out, pad_in, time, multiplier)
{
	// creates the target paths
	var list_elements = navigation_id + " li.sliding-element";
	var link_elements = list_elements + " a";
	
	// initiates the timer used for the sliding animation
	var timer = 0;
	
	// creates the slide animation for all list elements 
	$(list_elements).each(function(i)
	{
		// margin left = - ([width of element] + [total vertical padding of element])
		$(this).css("margin-left","-180px");
		// updates timer
		timer = (timer*multiplier + time);
		$(this).animate({ marginLeft: "0" }, timer);
		$(this).animate({ marginLeft: "20px" }, timer);
		$(this).animate({ marginLeft: "0" }, timer);
	});

	// creates the hover-slide effect for all link elements 		
	$(link_elements).each(function(i)
	{
		$(this).hover(
		function()
		{
			$(this).animate({ paddingLeft: pad_out }, 150);
		},		
		function()
		{
			$(this).animate({ paddingLeft: pad_in }, 150);
		});
	});
}

(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);