You need to learn how to use webmaster mode. It will help you find your way through templates quickly and easily.
Just turn on webmaster mode in the admin and then open your customer front end in a new window.
1. Can you post your home.tpl code here? Please post it between
tags. Thanks.
2. Dialogue border in css, and the top of that box is an image in your skin1/images folder. You will have to modify it to a new colour of your choice using some image editing software.