исправь её на functions::check()
if ( mysql_result ( mysql_query ( "SELECT COUNT(*) FROM `icq` WHERE `icq`='" .functions::check($icq). "' LIMIT 1 " ), 0 )==0) if ( mysql_result ( mysql_query ( "SELECT COUNT(*) FROM `icq` WHERE `icq`='" .functions::check($icq). "' LIMIT 1 " ), 0 )==0)