/**
 * @author Administrator
 */
var scrollSpeed = 50;
var scrollTimer = 1;
var scrollLines = 10;
function scrollStart(richting) {
	
	if (richting == 'omhoog') {
		document.getElementById('scrollDiv').scrollTop	= document.getElementById('scrollDiv').scrollTop-scrollLines;
	}
	if (richting == 'omlaag') {
		document.getElementById('scrollDiv').scrollTop	= document.getElementById('scrollDiv').scrollTop+scrollLines;
	}
	scrollTimer = setTimeout('scrollStart(\''+richting+'\');', scrollSpeed);
}
function scrollStop() {
	clearTimeout(scrollTimer);
}