492237 simple php mysql search on a table

I need a search script written to search the board table in the attached sql. The search will need to search the board_Keywords field and the board_userName. The search will receive a post of search words that will be comma delimited. The search should search for a match in either the board_Keywords or board_userName. The board_Keywords will have comma delimited list of key words for that board. the script should return an xml of the results. See attached for xml structure.