var scrollActive = false, scrollStop = true, scrollIncrement = 10, scrollInterval = 60;
var up = document.getElementById('upBtn');
var dn = document.getElementById('dnBtn');
var sc = document.getElementById('vScroller1');

function onScrollDnStart()
{
var up = document.getElementById('upBtn');
  var dn = document.getElementById('dnBtn');
  var sc = document.getElementById('vScroller1');
  if (!scrollActive) {
    dn.innerHTML = '<img src="img/layout/down_over.jpg" alt="" />';
    scrollStop = false;
    onScrollDn();
  }
}
function onScrollDn()
{
  var up = document.getElementById('upBtn');
  var dn = document.getElementById('dnBtn');
  var sc = document.getElementById('vScroller1');
  if (!scrollStop) {
    scrollActive = true;
    setTimeout('onScrollDn()', scrollInterval);
    var sc = document.getElementById('vScrollee1');
    var y = xTop(sc) - scrollIncrement;
    if (y >= -(xHeight(sc) - xHeight('vScroller1'))) {
      xTop(sc, y);
    }
    else {
      scrollStop = true;
      scrollActive = false;
      dn.innerHTML = '<img src="img/layout/down.jpg" alt="" />';
    }
  }
}
function onScrollUpStart()
{
var up = document.getElementById('upBtn');
var dn = document.getElementById('dnBtn');
var sc = document.getElementById('vScroller1');
  if (!scrollActive) {
    up.innerHTML = '<img src="img/layout/up_over.jpg" alt="" />';
    scrollStop = false;
    onScrollUp();
  }
}
function onScrollUp()
{
var up = document.getElementById('upBtn');
var dn = document.getElementById('dnBtn');
var sc = document.getElementById('vScroller1');
  if (!scrollStop) {
    scrollActive = true;
    setTimeout('onScrollUp()', scrollInterval);
    var sc = document.getElementById('vScrollee1');
    var y = xTop(sc) + scrollIncrement;
    if (y <= 0) {
      xTop(sc, y);
    }
    else {
      up.innerHTML = '<img src="img/layout/up.jpg" alt="" />';
      scrollStop = true;
      scrollActive = false;
    }
  }
}
function onScrollStop()
{
var up = document.getElementById('upBtn');
var dn = document.getElementById('dnBtn');
var sc = document.getElementById('vScroller1');
  up.innerHTML = '<img src="img/layout/up.jpg" alt="" />';
  dn.innerHTML = '<img src="img/layout/down.jpg" alt="" />';
  scrollStop = true;
  scrollActive = false;
}