Asynchronous file uploads

Here is a screen-shot of the async file upload I talked about in the earlier post.
The iframe is the "Upload File" UI element. It is embedded in the main form.
The main form has no idea of there being a file input element. All the file input logic is in the form element within the iframe. This way the file upload can even be re-used in different forms.

In fact livemocha has 2 forms where users can upload pictures. The first is when the user activates their account, the next is when they later would want to edit their profile information. I use the iframe code for both of those views. And that includes the controler logic that processes the image as well.