[Plugin: Shadowbox JS] Shadowbox "fall back" to MP4 for iPad/Phone?

I’m using Shadowbox.js to play a Flash video. It works perfectly and looks great, but I’d like to be able to support iPad/Phone users as well. I know Shadowbox can play MP4 files, but I don’t want to force PC users to download a plugin. Is there a way to specify in the code that FLV should be the default, but if the device doesn’t support it, then fall back to an MP4 file?