Hello!

It's possible have selectboxes with images instead words?

Regards

<input type="checkbox" name="inpChk1" />
<label for="inpChk1">
  <img src="/img/pic1.jpg" alt="a pic"/>
</label>

Did you even tried ?
I don't see any reason it should not...

i don't what checkbox but selectbox.

Oh, yeah, right....
Sorry.
Then no, not as I'm aware of.

Only background colors are supported I believe.

http://dhtmlkitchen.com/learn/css/forms/index5.jsp