ecards script not working in iframe

[lleighh]

I've been having a little trouble getting an ecard script (php opensource) to work for my client's site ... http://newdaypublishing.net/dev/index.php?page=e-cards

It works whenever I try it but when she tries it nothing happens. I've had two other people try it too; same result. They get errors about fields not being filled when they filled them all.

Is this a cms problem or iframe? The script is running off the same server and has it's own mysql db but I've pulled it into an iframe.