Why have our site's links stopped working in IE today?

Question

The company website is DNN-based: http://www.mrisoftware.com. This morning I was alerted that links "don't work", but nothing has changed today, so I'm stumped.

I verified that this is the case in Internet Explorer, although Firefox and Chrome are fine. The behavior: when the link is clicked on, it focuses, but the target URL doesn't resolve. A right-click opens in a new tab. I've tried poking around for answers on Google but this doesn't seem to be a common enough problem to have obvious answers at the top, and I'm stumped.

Naturally, the site was developed by an outside contractor, so we don't have a Web person here I can just ask (apart from me...and I'm, as above, stumped.)

Answer 1

I tested it locally, and it seems that these two lines are causing the problem:

<script src="http://munchkin.marketo.net/munchkin.js" type="text/javascript"></script>
<script>mktoMunchkin("155-CYD-020");</script>

They add the following line to every <a href=""> tag:
_mchInsLnk="true"

This causes them to not function right.