SMS-API Demo package are available in download section. Package include simple HTML form for sending SMS messages and to query SMS balance, script for initializing sms-api object and latest release of sms-api class.
CLICKATELL SMS API are now part of Drupal SMS Gateway module. Special thanks to David Hamilton and Drupal team. More info at http://drupal.org/node/34966
Visit project forum at http://sourceforge.net/forum/forum.php?thread_id=1005106&forum_id=344522
This is a beginning...