Hope this helps
In the "on open" event of your form set up an event procedure which sets all the fields you want to turn off and on by using the .visible method.
example... yourfieldsname.visible = true or false
then in the update event of your listbox set up an event procedure which makes the fields you want visible = true
example... if list35 = "credit" then
creditcardnumber.visible = true
cardtype.visible = true
authNumber.visible = true
paymentamount.visible = true
.
elseif List35 = "check" then
checknumber.visible = true
paymentamount.visible = true
end if
Hope this helps...