How do I remove Bootcamp partition from my hard drive?

My problem to solve is making more useable space on my Hard drive. I downloaded Paragon CompTune to reduce the size of the BootCamp partition. I reduced the partition but not enough. I then moved much stuff to external HD where I have plenty of space. I'm reluctant to remove the bootcamp partition because I don't have a Windows 7 disc to reinstall later. Time Machine won't back up the boot camp partition so I'll have to find another way.

Done, thank you.