new_window=null;
appname= navigator.appName;
appversion = navigator.appVersion;
majorver = appversion.substring(0, 1);

function popBox(filename, title, width, height){
if (new_window==null) 
 new_window=window.open(filename,title,"x=5,y=1,left=5,top=1,toolbar=no,scrollbars=yes,directories=no,menubar=no,location=no,resizable=yes,width="+width+",height="+height);
else {
 if ((appname == "Netscape") && ( majorver >= 3 ) ) {
    if (new_window.closed) {
	  new_window=window.open(filename,title,"x=5,y=1,left=5,top=1,toolbar=no,scrollbars=yes,directories=no,menubar=no,location=no,resizable=yes,width="+width+",height="+height);
  }
  else {
 new_window.close();
 new_window=null;
 new_window=window.open(filename,title,"x=5,y=1,left=5,top=1,toolbar=no,scrollbars=yes,directories=no,menubar=no,location=no,resizable=yes,width="+width+",height="+height);
   }
  }
if (appname == "Microsoft Internet Explorer") {
 new_window.close();
 new_window=null;
 new_window=window.open(filename,title,"x=5,y=1,left=5,top=1,toolbar=no,scrollbars=yes,directories=no,menubar=no,location=no,resizable=yas,width="+width+",height="+height);
 }
 }
}