$(document).ready(function(){
    $('.photo_gallery > ul > li:nth-child(3n+1)').css('clear','both');
    $('.photo_gallery').wrap('<div class="photo_wrapper" />');
    $('.photo_wrapper').append("<div class='scroll'><a class='scroll_button'>&nbsp;</a></div>");
    $('.photo_wrapper').find('.scroll_button').unbind('click').click(function(){
    	$('.photo_gallery > ul').stop(true,true).animate({top:'-=185px'},900,function(){
    		$('.photo_gallery > ul > li:lt(3)').appendTo('.photo_gallery > ul');
    		$('.photo_gallery > ul').css('top','0px');
    	});
    	
    });
});