Fake tabulated forms/button background colour

I'm trying to create a form that looks as though it has Tabs along the top. I assume the only way I can do that is to create buttons (in this case 4) that look like tabs and format those and the adjoining fields below so that it looks like it's a paper form with tabs.

A visual example of what I mean can be seen in the LiveCycle Help menu under 'Captions > Showing in Table Rows'.

First of all, if anyone has a better idea of how I can set this up, I'd love to hear it.

Secondly, I'm trying to set each button (tab) up such that when people click on them, the background changes colour. I can't see anything in the object palette that enables me to do anything other than set it to change text colour - not background colour.

Script-wise, I tried to set it up as a 'click' or a 'mouse-up' event, but I can't see what value to set for a button.

This is what I've got so far, but it doesn't work...

if(this.rawValue == 1)
{
this.fillColor = "255,255,221";
}
else
{
this.fillColor = "233,233,233";
}

I suspect it doesn't work because as far as I can tell, buttons don't have 'values' assigned to them, so my 'if(this.rawValue == 1)' statement is probably useless.

Any suggestions?
Thanks in advance,
Peta