Help with a report field

Can you write an if satement in a control source fild of a text box to
do the following. I am trying to get it to look at another field in the
form and depending upon what text is in that field it would return a
value. So if in the Site text box says rv1 or rv2 etc I want the other
field to show $20. Or if it has T101 or T102 etc. the the other field
would show $10. I think this should be possible. I don't know if I'm
trying to doit in the wrong area or if my syntx for the if statement is
just wrong. Any help would be apperciated.

Thanks
Dan

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