First, jerrygarciuh, shame on you for not originally posting the same code that you're having problems with. Posting different code (minus the commas) wastes peoples' time chasing down the wrong alleys.

I was in the process of writing an RTFM reply citing the MySQL doc for UPDATE, but found that it begins with

  UPDATE [LOW_PRIORITY] [IGNORE] tbl_name
      SET col_name1=expr1, [col_name2=expr2, ...]
      [WHERE where_definition]
      [LIMIT #]
[download]

which is wrong about comma placement (in a subtle way). It should read

  UPDATE [LOW_PRIORITY] [IGNORE] tbl_name
      SET col_name1=expr1 [, col_name2=expr2 ...]
      [WHERE where_definition]
      [LIMIT #]
[download]

I've sent a note about this to the MySQL folks.

Update: They've made the correction. Quick turnaround on their part.