[support] taxonomy block id

Hi Have set up site to use taxonomy_block for some menu listings. When more than one block is added page doesn't validate as taxonomy_block creates blocks with the same div id's for each menu block eg Menu Block 1 taxonomy_block_1 taxonomy_block_2 taxonomy_block_3 Menu Block 2 taxonomy_block_1 taxonomy_block_2 etc Any way to rename each separate block ref ids so page xhtml validates or another way round it? regards Rob