function launch(file,name,winwidth,winheight)      
{ 
var string= "width="+winwidth+",height="+winheight+"toolbar=no, directories=no,menubar=no,resizable=yes,dependent=yes"; 
hwnd = window.open(file,name,string) ;                  
          if (navigator.appName == "Netscape") { 
             hwnd.focus();
          }
}