The current code with the tag "SYSTEM!googleModifyTag_compact.js" does not work in Internet Explorer 9. The problem are the lines that look like:
return _orgWindowOpen(openurl, name, params);
They should be changed to read:
return _orgWindowOpen.apply(window,[openurl, name, params]);
In IE9, functions that originate as methods on an object (such as window.open) must now be called within the context of that object and not referenced directly. See the following IE9 page, which discusses the reasons: http://msdn.microsoft.com/en-us/library/gg622930(v=vs.85).aspx