easy slider jquery for background image

i am trying to slide background image with animate. as i want if my first background image. second will continues start

here is my code

$  ('.next').live('click',function() {
            $  ('.ac_bgimage').animate({
                left:"-80em"
            },1500, function(){
                test();
        });  

        });
        function test() {
        $  ('.ac_bgimage').attr('src','images/2.jpg');
        $  ('.ac_bgimage').css('left','0em');
    }

as first image is working fine but it display blank screen . in this blank screen i want second upcoming screen

Thanks in advance

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