Creates a Drupal Ajax 'insert/html' command.
The 'insert/html' command instructs the client to use jQuery's html() method to set the HTML content of each element matched by the given selector while leaving the outer tags intact.
This command is implemented by Drupal.ajax.prototype.commands.insert() defined in misc/ajax.js.
$selector: A jQuery selector string. If the command is a response to a request from an #ajax form element then this value can be NULL.
$html: The data to use with the jQuery html() method.
$settings: An optional array of settings that will be used for this command only.
An array suitable for use with the ajax_render() function.
http://docs.jquery.com/Attributes/html#val
function ajax_command_html($selector, $html, $settings = NULL) {
return array(
'command' => 'insert',
'method' => 'html',
'selector' => $selector,
'data' => $html,
'settings' => $settings,
);
}