HTML Tables - Urgent

Hi all,
I have a problem with the tables. Suppose I create a table with 2 columns say 75%, 25%. And in the 25% area i create one more table with 20 to 25 columns. The size of the area is getting bigger and the design of the table increases. It is more than 25%. Can anyone suggest me what to do to stop this? Even if i insert the cols or remove them, Is there any way my table is fixed to 25%?
Please help me. This is an emergency !!! I appreciate.
Thanks

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Thanks!
Eric

If you use percentages then it will expand over 25% since it has no where else to go. Only thing you might look into is the number of columns inside of the cell.