Bootcamp did not partition correctly - how to restore to previous state?

hello everybody
I carefully read many threads that were similar to my problem, yet did not find a response. Here the details:
I have a MacBook Pro running the latest version of Leopard (bought in March 2008). On the hard disk I stored a lot of pictures that I don't want to loose (just in case you suggest reformat/erase and reinstall). My hard disk has 186 GB.
I used BootCamp to make a second partition for Windows: 171 GB for Mac OS and 15 GB for Windows XP. I startet then the Windows install from the BootCamp Assistant. The very familiar screens of the Windows installation followed, up to the point where Windows required me to choose a partition on which to install Windows. Contrary to my expectation of seeing exactly the 2 partitions I had previously made, the list just showed one partition of 131 GB which was shown as unformatted. I panicked because I understood that something went terribly wrong and I chose the F3 "Quit without installing" option.
After that I tried to reboot the computer without any CD in the CD drive and I got only a black screen with a cursor blinking in the left upper corner of the screen. When booting and holding the option tab down I get only an options - Windows- which brings me back to the blinking cursor screen.
I printed the Apple documentation for troubleshooting installations and I started the Disk utility from the MacOS installation disk. The recommandation was to go to First Aid and repair the volume. However, although my hard drive is shown, the logical volume is not shown in the First Aid tab, so that I cannot repair or check anything.
Definitely Boot Camp is the evil-doer. I think it messed up with my boot sector and that is why I do not see any partition now, I just see the physical disk (as in hardware list). I have the slight suspicion that my disk is in perfect state, except for the first sector that actually holds the key to how to read all the other sectors. Here the theory:
"The first sector is called the boot sector and contains the Master Boot Record (MBR). The MBR contains the information concerning the location of partitions on the drive and reading of the bootable operating system partition."
Would anyone happen to know a small command line utility that just repairs this sector? I wouldn't mind to have it restored to the initial status, that is with the OS X operating system and one big partition.
Please help me with an option which allows me to return to my previous installation of MacOS without loosing the data on the hard drive.
Thanks a lot.

rman>reset database;
Resetting a Database Incarnation in the Recovery Catalog
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96566/rcmrepos.htm#456955

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