var scrollbar = new Control.ScrollBar('scrollbar_content','scrollbar_track');  

$('scroll_down_50').observe('click',function(event){  
	scrollbar.scrollBy(-50);  
   	event.stop();  
});  

$('scroll_up_50').observe('click',function(event){  
	scrollbar.scrollBy(50);  
	event.stop();  
});  

$('scroll_top').observe('click',function(event){  
	scrollbar.scrollTo('top');  
    event.stop();  
});  

$('scroll_bottom').observe('click',function(event){  
	//to animate a scroll operation you can pass true  
	//or a callback that will be called when scrolling is complete  
	scrollbar.scrollTo('bottom',function(){  
		if(typeof(console) != "undefined")  
		console.log('Finished scrolling to bottom.');  
	});  
	event.stop();  
});  

$('scroll_second').observe('click',function(event){  
	//you can pass a number or element to scroll to  
   	//if you pass an element, it will be centered, unless it is  
	//near the bottom of the container  
	scrollbar.scrollTo($('second_subhead'));  
		event.stop();  
});  
  
$('scroll_third').observe('click',function(event){  
	//passing true will animate the scroll  
  	scrollbar.scrollTo($('third_subhead'),true);  
	event.stop();  
});  

$('scroll_insert').observe('click',function(event){  
$('scrollbar_content').insert('<p><b>Inserted: ' + $('repeat').innerHTML + '</b></p>');  
	//you only need to call this if ajax or dom operations modify the layout  
	//this is automatically called when the window resizes  
	scrollbar.recalculateLayout();  
	event.stop();  
});