var pic = null
var popImg = null  // use this when referring to pop-up image
var picTitle = null
var imgCount = 0
var imgWinName = "popImg5"

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)+22)  + ",height=" 
           + (parseInt(windowHeight)+20)) 
  }

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
  }
// Use this function to control placement of pop-up window
// in Netscape 4+ and Internet Explorer 4+
function openPopImgWin(imgWinName, windowWidth, windowHeight){
  var leftX = 120  // distance of window's left side from left of screen
  var topY = 80   // distance of window's top side from top of screen
  var winFeatures = "toolbar=no,scrollbars=no,resizable=no,width=" 
    + windowWidth + ",height=" + windowHeight
  if (leftX>0){
    winFeatures += ",screenX=" + leftX + ",left=" + leftX       
                + ",screenY=" + topY + ",top=" + topY
    }
  return window.open("", imgWinName, winFeatures)
  }