How to make my external hard disk to be used by both MAC and PC?

I have an external hard disk which was firstly formated on a pc and that time i could wride and read it by a Pc but the Mac could only read it.
After that i formated it on the Mac and now The Mac can write on it but PCs dont even see it.
Can i do anything in order for my hard disk to work both on MAC and Pc?
PowerBook G4 Mac OS X (10.4.8)

http://discussions.apple.com/thread.jspa?messageID=4073062&#4073062
"Open Disk Utility. Select the drive entry for the external drive (Mfgr.'s ID and drive size) then click on the Partition tab. Select one (1) partition from the drop down menu. Click on the Option button and select the Master Boot Record (MBR) partition scheme then click on OK. Set the format type to MSDOS (FAT32) from the Format drop down menu. Click on the Partition button. Wait for the volume to mount on the Desktop. Select the volume entry (sub-entry of the drive entry) for the volume you just created, click on the Erase tab. Set the format type to MSDOS from the Format drop down menu, click on the Erase button. Wait for volume to mount on Desktop. You're done."
MacBook Pro 17" Mac OS X (10.4.9) BootCamp WinXP

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How to make my external hard disk to be used by both MAC and PC?

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