Unpartitioning HD without Boot Camp?? Please Help..!

I successfully installed boot camp and Windows XP Pro back in June. I have had no problems using it on my MacBook. I have come to a point where I have decided that I can live without Windows on my laptop. So with a total laps in judgement I reinstalled my Mac OSX on my MacBook. When I did this it erased the BootCamp that I used to install the partition on my HD. So at this point I have a fresh install of MAC OSX and I still have Windows on my laptop.

Does anyone know how to go in and remove the partition and restore the HD back to an all MAC format?

Download Boot Camp again and delete the partition.

I tried that and each time you download BootCamp and run it, the program wants you to chose where to install it. When I do this I install it on the Mac side. Should I be installing it on the Windows side? Because when you do it on the Mac side it doesn't work.