// Use this function to control placement of pop-up window
// in Netscape 4+ and Internet Explorer 4+
function openPopImgWin(imgWinName, windowWidth, windowHeight){
  var leftX = 150  // distance of window's left side from left of screen
  var topY = 150   // 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("pimg.html", imgWinName, winFeatures)
  }
  
function getLocation(winWidth, winHeight, winLeft, winTop){
   var winLocation = ""
   if (winLeft < 0)
     winLeft = screen.width - winWidth + winLeft
   if (winTop < 0)
     winTop = screen.height - winHeight + winTop
   if (winTop == "cen")
     winTop = (screen.height - winHeight)/2 - 20
   if (winLeft == "cen")
     winLeft = (screen.width - winWidth)/2
   if (winLeft>0 & winTop>0)
     winLocation =  ",screenX=" + winLeft + ",left=" + winLeft   
                 + ",screenY=" + winTop + ",top=" + winTop
   else
     winLocation = ""
   return winLocation
   }