var popWin   = null;
var winCount = 0;
var winName  = "popWin";
	  
function openPopWin(winURL, winWidth, winHeight, winFeatures, winLeft, winTop){
  var d_winLeft = 100  // default, pixels from screen left to window left
  var d_winTop = 300   // default, pixels from screen top to window top
    
  winName = "popWin" + winCount++ //unique name for each pop-up window
    
  closePopWin()           // close any previously opened pop-up window
        
  if (openPopWin.arguments.length >= 4)  // any additional features?
    winFeatures = winFeatures
        else
          winFeatures = ""

	    if (openPopWin.arguments.length == 6)  // location specified
          winFeatures += getLocation(winWidth, winHeight, winLeft, winTop)
        else
          popWin = window.open(winURL, winName, "width=" + winWidth
          + ",height=" + winHeight +",left="+((screen.width*.5)-280)+", top=200," + winFeatures)
      }
  
      function closePopWin(){    // 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(popWin != null) if(!popWin.closed) popWin.close()
      }
  
      function getLocation(winWidth, winHeight, winLeft, winTop){
        return ""
      }