Ok, I have to confess that this is rather embarrassing, but here goes. Quite a while ago, I was able to insert an image below our sidebar. When I view the page source, I can see what I need to change:

<div class="sidebarBottom"></div>
<div id="Sidebar" class="typography"><p><img class="leftAlone" src="assets/SplashImages/followus.png" alt="Follow Us!" width="195" height="34" usemap="#followus" title="" />
<map name="followus">
<area shape="rect" coords="121,2,149,29" href="http://www.facebook.com/EasternCenter" alt="EASTERN on Facebook"></area>
<area shape="rect" coords="151,3,177,29" href="http://intranet.eastech.org/wiki" alt="EASTERN Wiki"></area>
</map>
</p></div>

I need to remove the line <area shape="rect" coords="151,3,177,29" href="http://intranet.eastech.org/wiki" alt="EASTERN Wiki"></area>.

My problem is, I cannot find it in ANY file in my site! I have no idea where I entered this code to make the image appear and map the links on it. I've searched basically every file in my site, and although I can find references to it, such as:
<div class="FollowUs">
$Text
</div>

but I am quite out of practice and don't remember how or where I created this! Can anyone help me with this?