Creating Image Script Changer Dashboard Widget

I am trying to create a Dashboard widget that will allow me to change an image across my site using a radio button form. A demo version can be found here. This will be the page that I want to display in a widget on the Dashboard.

http://www.tornadoeskick.com/phpTest/chase-alert-form.php

What I want to do is select the alert level, hit submit, and it tells another PHP file what code to use. I then call this file from my site using the WP Include File plugin to call that image script.

Where the linked file above needs changes..

* Image on form page should only change when submit is pressed.
* Remove the “alertStatus” text near the image.
* Script gets written to a new PHP file.
* When submit is clicked, it reloads dashboard widget with new image displayed.

Any help would be amazingly appreciated!