When displaying an ad below the menu I'm getting a blue block line behind it. I'm pretty sure this is a style somewhere but no idea which class could be causing it. Is this a common issue? Any off the top of one's head ideas?
http://www.bsg47.org/index.php
I wasn't sure which ad you meant when I looked at your site but I use Mozilla Firefox as my browser and you can download an excellent plugin called Firebug which allows you to inspect classes and css code. You can choose an element and see how properties are set/inherited. See http://getfirebug.com/ Might help you to tie down the problem class....
It is very likely a setting in the ad code - look within the ad code for something like - border="x" where "x" is a numerical value, change it to zero (the number, not the word) and the blue border should go away.