/**
 * Background animation script
 * @author Alexander Farkas
 * v. 1.02
 */
 
$(function(){
	
	/* Background animation script */
	
	$.extend($.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]];
		   }
		}
	});
	
	/* Background animation call */

	$('.backToTopMask')

	.css({backgroundPosition: "30px 30px"})

	$('.backToTopLink').mouseover(function(){
		$('.backToTopMask').stop().animate({backgroundPosition:"(0 0)"}, {duration:250})
	})

	$('.backToTopLink').mouseout(function(){
		$('.backToTopMask').stop().animate({backgroundPosition:"(30px 30px)"}, {duration:250})
	})
	
	/* Back to the top scroll animation */
	
	$(".backToTopLink").click(function(){
		$('html, body').animate({scrollTop: $(".topOfTheWorld").offset().top}, 500); return false;
	 });

});