OS 10.4 - Partitions D:

I have an intel iMac 17" of the old white plastic variety. Using Bootcamp I run Windows for the purpose of games. When I created the Windows partition, I decided to split my hard disk 50/50 - that means:-

60GB for Mac
60GB for Windows

Bad decision. I need more space to accommodate for my games and I really don't want to redo the whole Bootcamp setup. I'm wondering if there's a way to split my Mac partition into two, and have the new third partition show up in Windows as a secondary hard disk. So basically:-

30GB for Mac
60GB for Windows
30GB Secondary HD for Windows

So is this possible? If not, how else can I shift over more disk space for use in Windows? Someone, anyone, help me!