// for Netscape 3+ and IE 4+
  var priorPic = new Array()
  var noPic = 0
  var foundit = false

  function openPopImg(picName,  windowTitle, windowWidth, windowHeight){
    var i = 0
    if(pic == picName && winOpen()){
      popImg.focus()
      }
    else{
      foundit = false
      for(i=0; i<=noPic; i++){
        if (priorPic[i] == picName)
          foundit = true 
        }
      pic = picName
      closePopImg()
      picTitle = windowTitle
      imgWinName = "popImg" + imgCount++ //unique name for each pop-up window
      if(!foundit){
        priorPic[noPic++] = pic
        }
      popImg = openPopImgWin(imgWinName, windowWidth, windowHeight)
      }
    }
  function openPopImgWin(imgWinName, windowWidth, windowHeight){
    var winFeatures = "toolbar=no,scrollbars=no,resizable=no,width=" 
      + windowWidth + ",height=" + windowHeight
    return window.open("pimg.html", imgWinName, winFeatures)
    }
  function winOpen(){
    if(popImg != null){ 
      if(popImg.closed != true) return true; else return false
      }  
    else
      return false
    }