var bk_popupIFrame = null;

function bk_shadow(bEnable)
{
  if (bEnable)
  {
    document.getElementById("shadow").style.width = document.body.parentNode.scrollWidth + "px";
    document.getElementById("shadow").style.height = document.body.parentNode.scrollHeight + "px";
    document.getElementById("shadow").style.zIndex = 10;
    document.getElementById("shadow").style.display = "block";
    if (navigator.appName == "Microsoft Internet Explorer")
    {
      var iFrame = document.createElement("IFRAME");
      iFrame.setAttribute("src", "/common/document/include/blank.html");
      iFrame.style.position = "absolute";
      iFrame.style.left = document.getElementById("shadow").offsetLeft + 'px';
      iFrame.style.top = document.getElementById("shadow").offsetTop + 'px';
      iFrame.style.width = document.getElementById("shadow").offsetWidth + 'px';
      iFrame.style.height = document.getElementById("shadow").offsetHeight + 'px';
      iFrame.style.filter = 'alpha(opacity=0)';
      document.body.appendChild(iFrame);
      bk_popupIFrame = iFrame;
    }
  }
  else
  {
    document.getElementById("shadow").style.width = "0px";
    document.getElementById("shadow").style.height = "0px";
    document.getElementById("shadow").style.zIndex = -1;
    document.getElementById("shadow").style.display = "none";
    if (navigator.appName == "Microsoft Internet Explorer" && bk_popupIFrame != null)
    {
      document.body.removeChild(bk_popupIFrame);
      bk_popupIFrame = null;
    }
  }
}