How to create a third partition without messing up Boot Camp partition?

I have been running a dual-partition Boot Camp setup (with Mac OS 10.5 and Vista) on my Macbook Pro with no hitches for the past year or so. Recently, I have decided that I want to create a third partition to boot into Windows XP. Of course, Boot Camp doesn't let me do this, so I am trying to do it manually by resizing my Mac OS partition and devoting the remaining space to a new partition. However, when I try to resize my Mac OS partition in Disk Utility, it warns me that "Changing the partition map may make this disk unbootable using Windows."
So I am wondering: is there any way for me to create a new Windows partition without messing up my preexisting Boot Camp setup?

I found this blog post shortly after the first BootCamp beta was out. I successfully split mine into three partitions per the instructions. However, since Leopard now lets you live partition your disk, you can probably do the partitioning via Disk Utility instead of using diskutil in Terminal.
<http://twoyearstwodays.blogspot.com/2006/05/bootcamp-sharing-data-between-osx-a nd.html>

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