function initScrollLayers() 
{
 
document.getElementById("wn1").style.height=ScrnHeight+"px";

  var wndo1 = new dw_scrollObj("wn1", "lyr1", null);

  wndo1.setUpScrollbar("dragBar1", "track1", "v", 1, 1);
   dw_showLayers();

}

function dw_showLayers() 
{

    if(document.getElementById("lyr1").clientHeight>=ScrnHeight)
    {
      var lyr=document.getElementById("scrollbar1");
      lyr.style.visibility = "visible";
    }
}