Image masks instead of flash

[jimjiminyjimjim]

I'm currently using circular image masks in flash to mask images that are dynamically loaded from a database. The images appear in a grid in individual circular frames

I'm looking to move from Flash to something that will work on the iPhone. Is there an alternative so that I can mask images that have been loaded into a div - probably something in Javascript?

[NeoDreamer]

<div style="width: 30px; height: 30px; background: url(actualImage.jpg)">
<img src="circularMaskTransparentPNG.png" width="30" height="30" />
</div>