var popupHandle;

function popup(picUrlString, windowWidth, windowHeight)
{
  if(popupHandle || popupHandle!=null)
  {
    if (!popupHandle.closed) popupHandle.close();
  }
  popupHandle=null;

  var x=(screen.width-windowWidth)/2
  var y=(screen.height-windowHeight)/2
  var featureString = "toolbar=no,scrollbars=no,resizable=no"
  featureString = ',left='+x + ',top='+y
  featureString += ',width='+windowWidth+',height='+windowHeight

  popupHandle = window.open("popup_nl.asp?windowWidth="+windowWidth+"&windowHeight="+windowHeight+"&picUrlString="+picUrlString ,"popup",featureString)
  return popupHandle;
}
function winclose()
{
  if (window.popupHandle!=null && !window.popupHandle.closed)
  {
    window.popupHandle.close();
    }
}
function doNothing(){}