var posY;
var muv;
var mdv;
iens6=document.all||document.getElementById
ns4=document.layers

if (iens6){
var crossobj=document.getElementById? document.getElementById("ascroll") : document.all.content
var ascrollHeight=crossobj.offsetHeight
}
else if (ns4){
var crossobj=document.nscontainer.document.nscontent
var contentheight=crossobj.clip.height
}
posY = 0;
var speed = 4;
function up() {
  if(posY<=(-1*(ascrollHeight-200))) { posY=(-1*(ascrollHeight-200)); }
  posY = posY-speed
 document.getElementById('ascroll').style.top = posY+'px';
 muv = setTimeout("up()",20)
}
function dw() {
  if(posY>=0) { posY=-1; }
  posY = posY+speed
 document.getElementById('ascroll').style.top = posY+'px';
 mdv = setTimeout("dw()",20)
}