Problem in IFrame width

[kk]

Hello all,

I have a table whose width is in terms of percentage(eg: 75%).Inside
that table i have an IFrame whose width is set to 100% so that it will
occupy entire width of the table (75%).If some of the pages(say
abc.aspx) dispalyed in IFrame has too many columns (appx. 20 nos),then
a horizontal scrollbar in created in my explorer....instead of
Iframe.So remaining 25% of my page is moved to right.

I want to avoid that this.My requirement is that the width of the
iframe should not increase more than the table width of 75%.How to
achieve this.........?

Please help me ...................

Thanks and Regards,
karthik