var tScroll;
	var curPos = 0;
	var direction=1;  
    
	function runTimer()
	{
	if (direction) {window.scroll(0,curPos++);}
	else           {window.scroll(0,       0); curPos=0;}
   
	if ( curPos > 170 ) direction=0;
	if ( curPos < 3 ) direction=1;
			
	tScroll = window.setTimeout("runTimer();", 100)
	}	

	window.onunload = new Function("clearTimeout(tScroll)")