(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);
var initResizeBkgHome = function(){
	$(window).resize(resizeBkgHome);
	resizeBkgHome();
}
	var resizeBkgHome = function (){
		var paramRatioGlobal = 148;
		var global = $('#global');
		var img = $('#imgBkg');
		if(img.length){
			var ratioGlobal = global.width()/(global.height()-paramRatioGlobal);
			//var imgHeight = (img.height()>0)? img.height() : 832 ;
			var ratioImg = img.width()/ img.height();
			if(ratioImg>ratioGlobal){
				img.addClass('imgHeight');
				img.removeClass('imgWidth');
			}else{
				img.addClass('imgWidth');
				img.removeClass('imgHeight');
			}
		}
	}