The Error that is seen is "_gat undefined", And I am sure you must have noticed such error.
But no worries, you can find the answers from the http://groups.google.com/group/analytics-help-troubleshoot
So as a solution, You can see the following example,
var gaJsHost = (("https:" == document.location.protocol) ? "https://
ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-
if (typeof(_gat) == 'object') // See this line, here is the use of typeof(_gat)
var pageTracker = _gat._getTracker("UA-abeen0-X"); // replace with your own tracking code
It should solve your problem of seeing error in your browsers.