document.observe('dom:loaded',function(){
	var scrollbar=new Control.ScrollBar('content-container-portfolio','scrollbar_track','scrollbar_up','scrollbar_dn');
	$('scrollbar_up').observe('click',function(event){
		scrollbar.scrollBy(-37);
		$('scrollbar_up').blur();
		event.stop();
	});
	$('scrollbar_dn').observe('click',function(event){
		scrollbar.scrollBy(37);
		$('scrollbar_dn').blur();
		event.stop();
	});
});