Unknown function _popupControl()

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In my Javascript Error Handler post, I discussed how I track user and client side errors. Recently, my error logs became inundated with tons of javascript errors. The function _popupControl() is undefined. After a little googling, I found out that the CA Personal Firewall is responsible for inserting the following code into every page:

<script type="text/javascript">_popupControl();</script>

Well, for whatever reason, that software is no longer providing that function to the page. Not sure about the inner workings. My concern is that Internet Explorer is generating a popup error on the page, however. This would make it look like my page is erroring out. Or even worse, it may stop other scripts.

I’ve implemented a work around, and I’m curious how well it will work. My javascript now includes this code:

if (typeof _popupControl != 'function') {
  var _popupControl = function() {};

This script simply checks to see if the _popupControl() function is defined. If it is not, it assigns it to an anonymous function that does nothing. Curious to see if this will work…

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