Protect table but not text in it - Word 2003

Hello,

Hope someone has a good suggestion for this problem. Using Windows XP and
Word 2003.

I have to create a table, one line, 5 columns. The columns' width and
height cannot be changed. I created a style for that table. The text in
each cell can be changed. The default is Arial, 10, bold. But if the user
needs to decrease the font size, he must be allowed. So, I protected the
table only (or the table style) but cannot unprotect the content. I want
users to be able to edit the font. How can I achieve this?

Your suggestions will be welcome.

Thank you.

Helen