Are you sure about that </td> on line 113? There is already a </td> at the end of line 112. You can't have a </td> followed by another </td> without a <td> or </tr><tr> between them. It might match to an opening <td> somewhere but you can't overlap table definitions. They have to cascade.

But like I said, I don't think it's causing the firebird problem anyway :)