Please fix the http/https mixup

[altenbach]

It has been reported long ago that certain page elements load insecure when browsing this site via https, causing browser warnings.

One example is my 25k shield:  

As you can see, most badges (e.g. the proven zealot badge) load via https as they should:

<img class="lia-user-rank-icon-left" title="Proven Zealot" alt="Proven Zealot" id="display_4" src="https://ni.i.lithium.com/ni/i/rank_icons/333.gif">

While the 25k badge (and some others, e.g. the 10k badge too) loads via plain http, causing security warnings.

<img class="lia-user-rank-icon-left" title="Knight of NI" alt="Knight of NI" id="display_6" src="http://forums.ni.com/html/rank_icons/25k_shield.gif">

Somebody needs to fix this. Should be trivial! Thanks!