HTML/CSS help... again

This stuff is doing my head in. :P

Is it possible to apply more than one class style to an element? e.g. I would like to do something like:

<h1 class="this" class="that">
Hello world!
</h1>

But obviously that syntax doesn't work. Any ideas? Thanks.

Nevermind.

Some research shows that this probably isn't worth doing, anyway - for compatibility reasons.

class="this that"

Yeah, I tried that, octo - as I said, there are are compatibility issues. I couldn't get it to work reliably.

I've found another way around my prob now, anyways. :)