Description of problem:
Disk requirment menu should allow return to package selection instead
of or in addition to "reboot" option.

Version-Release number of selected component (if applicable):
FC3 gold

How reproducible:
install with "linux text"
follow the menus and select what you would like to install
The screen following the "building depencies" shows you what disks you
need to complete the install you chose.  The two options are to either
reboot or continue. 
This should allow another option to return to the package selection.
Say you have disk 1 and disk 2, but no disk 3 or 4, then you could
return and remove the packages that required the additional CD so you
do not need to reboot and start the whole process over. 
An option of "back" would also suffice.

Steps to Reproduce:
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Actual results:


Expected results:


Additional info: