var dy;
var pos=0;
var klokje=null;

function getStyle( layer ) {
	if( document.getElementById ) {
		return document.getElementById( layer ).style
	} else if( document.all ) {
		return document.all[layer].style
	} else {
		return document[layer]
	}
}
function clip( layer, top, right, bottom, left ) {
	if( document.getElementById || document.all ) {
		getStyle( layer ).clip='rect('+top+' '+right+' '+bottom+' '+left+')'
	} else {
		document[layer].clip.top = top
		document[layer].clip.left = left
		document[layer].clip.bottom = bottom
		document[layer].clip.right = right
	}
}
function scroll() {
	if ( pos+dy <= 0 ) {
		pos += dy;
		getStyle('margin').top = pos;
		clip('margin', 0-pos, 213, 213-pos, 0);
		klokje = setTimeout( 'scroll()', 20 );
	}
}
function stop() {
	clearTimeout( klokje );
}