function scrollbarup(evt){
	var b = document.getElementById('scrollbar');
	document.onmousemove = '';
	document.onmouseup = '';
}

function scrollbarmove(evt){
	var b = document.getElementById('scrollbar');
	var s = document.getElementById('scrollslider');
	var t = evt.pageY-b.offsetParent.offsetTop;
	if(t<0){t=0;}
	if(t>b.offsetHeight){t=b.offsetHeight;}
	s.style.top = t + 'px';	
}

function scrollbardown(evt){
	var b = document.getElementById('scrollbar');
	var s = document.getElementById('scrollslider');
	document.onmousemove = scrollbarmove;
	document.onmouseup = scrollbarup;

	var t = evt.pageY-b.offsetParent.offsetTop;
	if(t<0){t=0;}
	if(t>b.offsetHeight){t=b.offsetHeight;}
	s.style.top = t + 'px';	
}

function release(){
	
}

function scrollbarInit(){
	b = document.getElementById('scrollbar');
	s = document.getElementById('scrollslider');
	b.onmousedown = scrollbardown;
	s.onmousedown = scrollbardown;
		
//	alert(s);
}