CI problem: Upload image without submitting form?

[eluser]super_Tai[/eluser]
Hi everybody!

I'm a newbie.

I want to upload image file without submitting form. It is like:

https://picasaweb.google.com/10277125856...8084731186

This is an "Edit form". I want to click "Upload" button to upload another image file and preview.

I tried using some javascript, ajax, jquery which is directed on some websites, but it can't do that. Even, I tried doing like "http://net.tutsplus.com/tutorials/javascript-ajax/how-to-upload-files-with-codeigniter-and-ajax/", but it still require submitting form.

My knowledge about javascript, ajax, jquery is not much.

Can you give me an example via my email or in this topic? Thanks!

please, help me.

my email: mrdhtai@yahoo.com or sieutaibk@yahoo.com