function init()
{
  if (iens6)
  {
    crossobj=document.getElementById? document.getElementById("uchwyt") : document.all.content
    contentheight=crossobj.offsetHeight
  }
  else 
    if (ns4)
    {
      crossobj=document.nscontainer.document.nscontent
      contentheight=crossobj.clip.height
    }

  getcontent_height();
}

function movedown()
  {
    if (window.moveupvar) clearTimeout(moveupvar)

    if (iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+100))
      crossobj.style.top=parseInt(crossobj.style.top)-speed+"px"
    else
      if (ns4&&crossobj.top>=(contentheight*(-1)+100))
	crossobj.top-=speed
   movedownvar=setTimeout("movedown()",20)
  }

function moveup()
{
  if (window.movedownvar) clearTimeout(movedownvar)
  if (iens6&&parseInt(crossobj.style.top)<=0)
      crossobj.style.top=parseInt(crossobj.style.top)+speed+"px"
  else
    if (ns4&&crossobj.top<=0)
      crossobj.top+=speed
  moveupvar=setTimeout("moveup()",20)
}

function stopscroll()
{
  if (window.moveupvar) clearTimeout(moveupvar)
  if (window.movedownvar) clearTimeout(movedownvar)
}

function movetop()
{
  stopscroll()
  if (iens6)
  crossobj.style.top=0+"px"
  else
    if (ns4)
      crossobj.top=0
}

function getcontent_height()
{
  if (iens6)
    contentheight=crossobj.offsetHeight
  else 
    if (ns4)
      document.nscontainer.document.nscontent.visibility="show"
}

var speed=10
var crossobj
var contentheight

var iens6=document.all||document.getElementById
var ns4=document.layers

window.onload=init