Disk Utility - create ISO Data DVD image for burning?

Which are the exact options in Disk Utility that I need to select, in order to create an ISO DVD Data image that will be readable by PCs and Macs alike?
I have looked on the web and in the help but am none the wiser due to lack of an explanation of the options
Format: Mac OS Extended (journaled),...,MS-DOS (FAT)
Partitions:Single partition - Apple Partition Map,...,Single Partition CD/DVD with ISO data
If you cannot point me in the direction of some decent documentation, please just tell me which options I need to select to create an ISO Data DVD
Thanks

Try this link.
Basically, you can drag a folder into the list on the left. Then, with the folder selected, click New Disk Image from the toolbar at the top (not sure of the exact wording, but it's something along those lines). Make sure to select ISO from the pop-up menu.
Also try this article to convert a DMG to ISO.

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