function validate(f){
  // Check that there was some text

  if ( f.username.value.length == 0 ) {
    alert("Please enter your user name.")
    f.username.focus(); 
    return false;
  }

  
  if ( f.pswd.value.length == 0 ) {
    alert("Please enter your password.")
    f.pswd.focus(); 
    return false;
  }

     return true;
}