I don't know about the IP based alert but when I go to the IE side with I don't get any type of problem although I do suspect that the thing you describe is what happens when you test the page on your computer.
I get that warning when I test certain javascript scripts locally becuase they try to access files located on my pc (which is ok because that is where everything is) but when you upload it and all files and view the page online the warning doesn't come up because the files it trys to access is on the server.

and this line gives an error in FF and IE:

Code: Select all

<script language='javascript'>postamble();</script>