var scrollingUp = false;
var scrollingDown = false;

function omhoog(action)
{
	var el = document.getElementById('scrollerpage');
	
	if(action=='start') { scrollingUp = true; }
	else if(action=='stop') { scrollingUp = false; }
	
	el.scrollTop = (el.scrollTop-2);
	
	if(scrollingUp) {
		// Hier is de scroll snelheid 20
		setTimeout('omhoog()', 20);
	}
}

function omlaag(action)
{
	var el = document.getElementById('scrollerpage');
	
	if(action=='start') { scrollingDown = true; }
	else if(action=='stop') { scrollingDown = false; }
	
	el.scrollTop = (el.scrollTop+2);
	
	if(scrollingDown) {
		// Hier is de scroll snelheid 20
		setTimeout('omlaag()', 20);
	}
}