Apply CSS Rules Only If 2 Classes are Set to an Element

Possible Duplicate:
Can you target an element with CSS only if 2 classes are present?
CSS Selector that applies to elements with two classes

Is there a way to apply a CSS style to an element only if 2 classes are applied to it?

For example, apply my custom styles to this:

<div class="one two">Text</div>

But not to these:

<div class="one">Text</div>
<div class="two">Text</div>