[jQuery] Cycle plugin: pulling in only child elements with a certain class?

[fallingandlaughing]

Hello,

If my HTML for a cycle slideshow is something like the following,
where certain child divs (slides) have a particular class:

<div id="slideshow">
    <div class="slide web"><img ...></div>
    <div class="slide"><img ...></div>
    <div class="slide web"><img ...</div>
</div>

is there any way to set up the slideshow so that cycle only pulls in
the child divs with a class of "web", instead of all the divs with a
class of "slide"? So in the above example, the slideshow would contain
2 elements instead of 3.

I thought it might be possible using the slideExpr option, but I think
I'm misunderstanding how that works. When I try this:

        $('#slideshowl').cycle({
            fx:    'fade',
            pause:  1,
            speed:    600,
            timeout:  3,
            slideExpr: 'div.web'
        });

I get an empty set.

Any assistance would be massively appreciated.

Cheers,

Erik