var scroll_handler = 0;
 var scroll_dir = 0;
        var scroll_2up = function(){ if(!scroll_handler) { scroll_dir=-5; scroll_handler = window.setInterval(scroll_step,60); } }
        var scroll_2down = function(){ if(!scroll_handler) { scroll_dir=5; scroll_handler = window.setInterval(scroll_step,60); } }
        var scroll_stop  = function(){ if(scroll_handler) { window.clearInterval(scroll_handler); scroll_handler = 0; } }
        var scroll_step  = function() {
            if (!scroll_handler) return;
            var avail_height = jQuery("#scroll")[0].scrollHeight;
            var child_height = jQuery("#scroll .scroll_content")[0].scrollHeight;
            var d = jQuery("#scroll .scroll_content");
            var offset = parseInt( d.css("margin-top") );
            if (
  (scroll_dir < 0 && offset < 0) ||
  (scroll_dir > 0 && child_height + offset + 24 > avail_height)
        ) { d.css({ marginTop: offset - scroll_dir }); } else scroll_stop();
        }
        jQuery(function(){
            jQuery("#scroll .scroll_content").css({marginTop:0});
//            jQuery("#scroll_top").mousedown(function(){ jQuery("#scroll .scroll_content").css({marginTop:0}) });
            jQuery("#scroll_top").mouseover(scroll_2up).mouseup(scroll_stop).mouseout(scroll_stop).mousedown(scroll_2up);
            jQuery("#scroll_down").mouseover(scroll_2down).mouseup(scroll_stop).mouseout(scroll_stop).mousedown(scroll_2down);
        });