TOPIC: Next Step not functioning

I have PayPal standard setup as the method of payment and for some reason the Next Step button is no longer working. I've tested it several times before and it worked fine, but now it doesn't do anything. It should be creating the new joomla user and directing to paypal to complete the payment process. I see only one error in firebug but it seems like it's only for an image...
Image corrupt or truncated: http://www.instantstorageonline.com/com ... oading.gif

Here's the link to the page on my site....
http://www.instantstorageonline.com/com ... Itemid,18/

Any ideas???

Just saw your post now, I also posted the same issue as well earlier.

http://www.dthdevelopment.com/index.php ... =16&t=7175

Any ideas? Looks like there are a few of us experiencing this same issue. I'm also running Joomla 1.5.23 and DT Register 2.7.5. I'd be glad to PM a temp admin if needed.