questions about disk partitions

[Eric <deb-user@semiosphere.info>]

Hello all. 

I was in need of some more hard disk space and so I figured I'd reclaim some
of the unused space in my rarely used XP partition. XP is located on hda1.
I resized hda1 from 35GB to 15GB using ntfsresize leaving ~20GB of free
space, but I can't create a new partition since I've already got 3 primary
partitions (+ 1 extended). Is there any way I can create a logical
partition out of the now unused space on hda1 (keeping in mind that the
free space is physically located between hda1 and hda2)?