(function($){$.fn.movebg=function(options){var defaults={width:120,extra:50,speed:300,rebound_speed:300};var defaultser=$.extend(defaults,options);return this.each(function(){var _this=$(this);var _item=_this.children("ul").children("li").children("a");var origin=_this.children("ul").children("li.cur").index();var _mover=_this.find(".move-bg");var hidden;if(origin==-1){origin=0;hidden="1"}else{_mover.show()};var cur=prev=origin;var extra=defaultser.extra;_mover.css({left:""+defaultser.width*origin+"px"});_item.each(function(index,it){$(it).mouseover(function(){cur=index;move();prev=cur})});_this.mouseleave(function(){cur=origin;move();if(hidden==1){_mover.stop().fadeOut()}});function move(){_mover.clearQueue();if(cur<prev){extra=-Math.abs(defaultser.extra)}else{extra=Math.abs(defaultser.extra)};_mover.queue(function(){$(this).show().stop(true,true).animate({left:""+Number(cur*defaultser.width+extra)+""},defaultser.speed),function(){$(this).dequeue()}});_mover.queue(function(){$(this).stop(true,true).animate({left:""+cur*defaultser.width+""},defaultser.rebound_speed),function(){$(this).dequeue()}})}})}})(jQuery);