MySQL database error

mysql error: Illegal mix of collations (hebrew_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='

Query Failure: SELECT `id` FROM `category` WHERE `pageid` = 'זר_מתוק'
mysql error number: 1267
Date: 04-02-2012 17:42:53
Script: http://www.ganeden2000.co.il/index.php
IP Address: 38.107.179.223