Scroll Buttons

<script type="text/javascript">
			<!--
			 var timer_up;
			 var timer_down;


          		 function scroll_up( width )
			 {
 				window.frames['i-frame'].scrollBy(0, -width);
 				timer_up = setTimeout('scroll_up( ' + width + ' )', 20);
			 }


			 function Aufhoeren_up()
			 {
 				clearTimeout(timer_up);
			 }


          		 function scroll_down( width )
			 {
				window.frames['i-frame'].scrollBy(0, +width);
 				timer_down = setTimeout('scroll_down( ' + width + ' )', 20);
			 }


			 function Aufhoeren_down()
			 {
 				clearTimeout(timer_down);
			 }
 			//-->
		</script>