var popWin =null    // use this when referring to pop-up window
	var winCount = 0
	var winName = "popWin"
	function openPopWin(winURL, winWidth, winHeight, winFeatures, winLeft, winTop)
	{
	  	var d_winLeft = 20  // default, pixels from screen left to window left
  	  	var d_winTop = 20   // 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
    			winFeatures += getLocation(winWidth, winHeight, d_winLeft, d_winTop)
  				popWin = window.open(winURL, winName, "width=" + winWidth + ",height=" + winHeight + winFeatures)
  	}
	
	function closePopWin()
	{    
  		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 ""
 	}