Setting the number of old versions displayed in the boot list

[Randy Decker]

Hello,
Having selected save all old versions when installing Ubuntu 9.10, I now have 
more than a screen full of versions in the grub boot menu.  I have looked in 
the official manual and the scripts in grub.d without learning how to change 
the behavior to save 2 old versions.  Is that behavior controlled by GRUB2?  If 
so where should one search for how to change the setting.  My Windows XP O/S is 
of course at the bottom of the list with Linux as the default where it should 
be.  The prober finds XP on two drives but I would be happy to find how to 
block one of them from appearing in the boot list.
Tnx,
Randy