window.addEvent('domready', function(){



	var size = $("scrolling_content").getSize();

	var s = (size.scrollSize.y/50).round();

	if(size.scrollSize.y > s){
		s++;
	}

	var scrollingdiv = new Slider("scroll_track","scroll_drag",{
		steps: s,
		mode: "vertical",
		wheel: true,
		onChange: function(step){
			$("scrolling_content").scrollTo(0,step*50);
		}
	});

$("scroll_up").addEvent("click",function(){   
if(scrollingdiv.step > 0){
			scrollingdiv.set(scrollingdiv.step-1);
		}
	});

	$("scroll_down").addEvent("click",function(){
		if(scrollingdiv.step < scrollingdiv.options.steps){
			scrollingdiv.set(scrollingdiv.step+1);
		}
	});
	
	
	

});