Currently:

/**
 * print a HTML link with a button look
 * @param string  $p_link       The page URL.
 * @param string  $p_url_text   The displayed text for the link.
 * @param boolean $p_new_window Whether to open in a new window.
 * @param string  $p_class      The CSS class of the link.
 * @return void
 */
function print_link_button( $p_link, $p_url_text, $p_class = '', $p_new_window = false )