Whats up with FireFox displaying things perfectly, yet IE fails to ...!

I've attached a screenshot of a website I'm editing at present

a) my testimonials block is not showing up properly (in FF, the white is transparent)

b) all my images are getting a nasty blue hyperlink border - whats the quick fix code through the themes CSS that will sort this

c) If a user goes to the site in IE6, it doesn't display properly. Thats cool - if you go to say here:http://www.lifefm.co.nz in IE6 - it shows a choice message saying upgrade - how do I get this site to do something similar?

Any help would be much appreciato.