var layer;
			var timer;
			var scrollheight=350;		

			function init(id) {
				layer = document.getElementById(id);
				layer.style.top = 0;
			}
	

			function gethoehe() {
				return layer.offsetHeight;
			}
	

			function scrolldown(speed) {

				if ( gethoehe() + parseInt(layer.style.top) > scrollheight) {
					layer.style.top = parseInt(layer.style.top) - parseInt(speed) + 'px';
					timer = window.setTimeout("scrolldown('"+speed+"')",25);
				}
			}


			function scrollup(speed) {

				if (  parseInt(layer.style.top) < 0) {
					layer.style.top = parseInt(layer.style.top) + parseInt(speed) + 'px';
					timer = window.setTimeout("scrollup('"+speed+"')",25);
				}
			}


			function stopscroll() {
				window.clearTimeout(timer);
			}