var AMOUNT=5; /* distance to scroll for each time */
var TIME=5; /* milliseconds */
var timer=null;
var timer2=null;

function scrollIt(v)
{
var direction=1;
var distance=AMOUNT*direction;
window.scrollBy(0,distance);
}
function down(v)
{
  //alert("down");
  if(timer) { clearInterval(timer); timer=null; }
  if(v==true)timer=setInterval("scrollIt(true)",TIME);
}


function scrollIt2(v)
{
var direction2=-1;
var distance2=AMOUNT*direction2;
window.scrollBy(-1,distance2);
}
function top(w)
{
  //alert("top");
  if(timer2) { clearInterval(timer2); timer2=null; }
  if(w==true)timer2=setInterval("scrollIt2(true)",TIME);
}