var win;

        function showWindow(url) {
if ( url == null) {
url = "/help/index.html";
}

         if (win == null || win.closed){
                        win = window.open(url, "win", "toolbar=no,location=no,directories=no,left=50,top=50,status=no,menubar=no,scrollbars=yes,resizable=yes,width=600,height=500")
                }else{
                        if (navigator.appName.substring(0.8) == "Netscape"){
                                win.location.href = url;
                                this.win.focus();
                        }else{
                                win = window.open(url, "win", "toolbar=no,location=no,directories=no,left=50,top=50,status=no,menubar=no,scrollbars=yes,resizable=yes,width=600,height=500")
                        }
                }
        }