With regards to the white borders around images, you need to turn off the borders on those images nested within anchors:
Code:
a img { border: 0 }
Your JavaScript error is showing up in more than just Internet Explorer. The reason is because you're trying to initialize your ticker object twice, but the second time you try, the placeholder element is no longer there (since it was converted by the first attempt), and therefore the script fails.
You're attempting to create a ticker in site.js on line 3, and also index.php on line 192. Remove one of these commands and the errors will go away.