var pic = null

var popImg = null  // use this when referring to pop-up image

var picTitle = null

var imgCount = 0

var imgWinName = "popImg"



function openPopImg(picName, windowTitle, windowWidth, windowHeight){

  closePopImg()

  picTitle = windowTitle

  imgWinName = "popImg" + imgCount++ //unique name for each pop-up window

  popImg = window.open(picName, imgWinName,

           "toolbar=no,scrollbars=no,resizable=no,width="

           + (parseInt(windowWidth)+10)  + ",height="

           + (parseInt(windowHeight)+10))

  }

function closePopImg(){    // close pop-up window if it is open

  if (navigator.appName != "Microsoft Internet Explorer"

      || parseInt(navigator.appVersion) >=4) //do not close if early IE

    if(popImg != null) if(!popImg.closed) popImg.close()

  }

function setStatus(msg){

  status = msg

  return true

  }