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