What prevents a part of my webpage from delivering as https content?

I have two web sites that are built in a similar fashion, but one is having problems delivering some content in https. As a result it generates an alert (see image).

An expert isolated the content that is causing the problem, and I believe this is a menu tree control. To see the error, you can browse to https://depthbydistance.com/desktop/Entry.aspx 

I'm hoping to work with an expert to troubleshoot the cause of the error, and recommend steps to correct it.
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Try removing the
<script type="text/javascript" src="http://www.statcounter.com/counter/counter.js"></script>
from the page...
This is simple, in your browser click "view source" and search for "http:".
You should replace all that you find in the content area with "https:".

At first look the only thing triggering the message is the counter

<script type="text/javascript"

Theoretically you should use https://www.statcounter.com/counter/counter.js but I see that this site doesn't have a correct SSL ceritficate so probably you should remove this counter at all or find a counter provider that works on https.

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JeReLoAuthor Commented:
thanks both, I removed stat counter and went back to google analytics, which does work with https.

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