At EBI we develop complete packages for your small to medium size business. We don’t want our customers wondering who to call if they get an email about their domain registration or how to add something to their website. So, for our customers we offer the development, setup, management, security patches and upgrades to your site on our servers plus DNS management and domain registration.
$form['site_slogan'] = array(
'#type' => 'textfield',
'#title' => t('Slogan'),
'#default_value' => variable_get('site_slogan', ''),
'#maxlength' => 340,
'#description' => t("Your site's motto, tag line, or catchphrase (often displayed alongside the title of the site).")
In the modules- system system.admin.inc add the maxlength