364303 Add Custom Field in WP-Admin

I am using the Arras Theme on my Wordpress installation. In the 'Theme Options' area I would like to add the following functionality: 'Add Image' - Allows me to enter a URL, Image URL and Title. 'Remove Image' - Lists the Images I have added so I can remove them from the admin if required. When I 'Add Image' the website should cache this image onto my server and refresh the image every 5 minutes. When the image is cached, it should be cached with a unique prefix so that no other files overwrite this file if I add another Image URL with the same file name. It should then be possible to display these 3 pieces of data via a custom page template. For this part I just require the PHP Echo statement that I should use. A simple task for anyone who has worked with Wordpress Admin before. n.b this is on an WordpressMU installation but this shouldn't make any difference.. Please bid soon as I'd like the work doing asap. Thanks