Partitioning startup volume

hi,
i'm a newbie on Mac OS X and I want to partition my HD, which has the startup volume on it. the HD is freshly formatted since there was an error in the header of the volume (?) and the Disk Utility couldn't repair it (Repair button disabled).
so, in the Disk Utility, I used the Partition section of my HD and tried to create 2 partitions, but the Utility wouldn't let me do so because "it's the startup volume".
so how the **** am I suppose to partition the only drive in my notebook?
i'd like to have 2 partitions of 54 GB and 20 GB (total 74).
aaaaaaaaaaaahhhhhhhh please teach me!
NOTE: maybe I used some wrong technical terms because I had to translate them from my OS X French version.

You must do the following:
1. Boot from your Tiger DVD. After the installer loads select your language and click on the Continue button, then select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the volume(s) mount on the Desktop.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process will take 30 minutes to an hour or more depending upon the drive size.
This is a destructive process so your hard drive will be completely erased.

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