Replace message textfield by textarea

It's more simple for users to write in a multilines textarea than a single line textfield.

In file shoutbox.module, line 480, replace:

  $form['message'] = array(
    '#type' => 'textfield',
    '#default_value' => $default_msg,
    '#size' => 15,
  );

By:

  $form['message'] = array(
    '#type' => 'textarea',    
    '#default_value' => $default_msg,
    '#cols' => 15,
    '#rows' => 4,
  );