$(document).ready(function(){  	
    var item_num=0;	 
	 var item_height=128;
	 var scroll_speed=600;     
	 var cont_height=parseFloat($(".lcolumn .foto").css("height"));		 
	 $(".lcolumn .foto .scroll div").each(function() {item_num++;}); 		 
     all_item_height=item_height*item_num; 	
	 var dif=all_item_height-cont_height;	 
	 if (dif > 0) $(".lcolumn .down-but").css("visibility", "visible"); 
    $(".lcolumn .down-but").click(function(){		
        $(".lcolumn .foto .scroll").animate({top: "-="+item_height}, scroll_speed);		
		$(".lcolumn .up-but").css("visibility", "visible");     	
		dif=dif-item_height;		  	
        if (dif<0) $(".lcolumn .down-but").css("visibility", "hidden");		
        return false;
    }); 
	$(".lcolumn .up-but").click(function(){	
		$(".lcolumn .down-but").css("visibility", "visible"); 
        $(".lcolumn .foto .scroll").animate({top: "+="+item_height}, scroll_speed);	
		dif=dif+item_height;	
		if (dif+1 > all_item_height-cont_height) $(".lcolumn .up-but").css("visibility", "hidden");				  	        		
        return false;
    });  
	
});