Checked the code:
1. You site contains several structural errors, please use W3 in order the fix the worst ones.
2. Confirmed that the function uddeimOpenWindow cannot be found though it is defined a few lines above the call. Maybe this is a result of 1.
3. Something modifies your site code:
Code:
uddeimWindow.document.writeln("<html xmlns:fb="http://www.facebook.com/2008/fbml"><head><title>uddeIM<\/title><link rel='stylesheet'
As you see the code is modified in a way that
xmlns:fb="
www.facebook.com/2008/fbml
" in added and the Javascript interpreter has problems wth the neested quoted.
Which buggy plugin adds this unneeded stuff?
You could hack uddeIM code in order to fix this error but I recommend to contact the author that his code modifies not only the first html tag but also code that is part of Javascript output.