Indenting in a select tag

System

Hey Everyone,

I have a select box defined in my datacapture.cfg, and I would like the options' label to be indenetd sometimes (cause some options are essentially sub-options).
I tried putting spaces, non-breaking-spaces, and other possible tags, but nothing works.
I came across this "optgroup" tag which seemed promising, though that did not work either.
I have the following code:

[html]

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[/html]

"optgroup" is not working, as it makes the whole section under optgroup just not show up.
Is something wrong with this code? Is there another way to approach this?

Thanks,
Ido