var varwin = null;               // use this when referring to the window
 var wincount = 0;
 var winname = null; 
 function newwin(winURL, winW, winH, winFeat, winL, winT){
   self.name = "main";           // names current window as "main"	     
   var d_winL = 20            // default, pixels from screen left to window left
   var d_winT = 60             // default, pixels from screen top to window top
   winname = "varwin" + wincount++          //unique name for each pop-up window				
   if(varwin && varwin != null) if(!varwin.closed) closewin()                      // close any previously opened pop-up window
   if (newwin.arguments.length >= 4)     // any additional features? 
     winFeat = "," + winFeat
   else 
     winFeat = "" 
   if (newwin.arguments.length == 6)          // location specified
     winFeat += getLocation(winW, winH, winL, winT)
   else
     winFeat += getLocation(winW, winH, d_winL, d_winT) 
   varwin = window.open(winURL, winname, "width=" + winW + ",height=" + winH  + winFeat  + ",top=" + d_winT)
   if (varwin.opener == null) {              // for Nav 2.0x
        varwin.opener = self                // this creates and sets a new property
             }
	 }   
  function getLocation(winW, winH, winL, winT){
   return ""
   } 
   
   var whoAmI = navigator.appName;
   
 function closewin(){                       // close pop-up window if it is open 
     if (whoAmI != "Microsoft Internet Explorer" 
      || parseInt(navigator.appVersion) >=4)            //do not close if early IE
     if(varwin && varwin != null) if(!varwin.closed)
     varwin.close();
     if (whoAmI == 'Netscape'&& varwin && varwin != null)
     varwin.close();
   }