var b_stop;
function scroll_u(b,defwin)

{
if(b) b_stop=true; 
defwin.scrollBy(0,10);
 if (b_stop) 
 	{ 
	setTimeout("scroll_u(0,jingju)",100);
	}
}
function scroll_d(b,defwin)
{
if(b) b_stop=true;
defwin.scrollBy(0,-10);
if (b_stop) 
	{
	 setTimeout("scroll_d(0,jingju)",100);
	}
}
function stop()
{ b_stop=false;}