Hi
I see that you have javascript google-analytics.com/ga.js added on your website and this comes before <!DOCTYPE. According to the standards, nothing should come before the DOCTYPE declaration and opening html tag, not even a comment.
This is not a big deal for other browsers, but ie doesn't accept well. So, try to remove this lines or move them to right position.
Suggestion:
If you want to add your google analytics code to your website, there's no need to change manually to call this javascript. Search joomla extensions directory and you will find lot's of plugins that will make your life easier. You need only to add the code provided by google on the Plugin.
Cheers
