function location_roll(richtung)
{

if (richtung == 'up')
	{
	location_iframe.scrollBy(0, -30);
	rollen = window.setTimeout("location_roll('up')", 10); 
	}

if (richtung == 'down')
	   {
	location_iframe.scrollBy(0, +30);
	rollen = window.setTimeout("location_roll('down')", 10); 
	   }
    }

function stoppit () {
  	window.clearTimeout(rollen);
    }