Update header.html

docs/_includes/header.html

@@ -4,7 +4,7 @@
 			<h1>MaxKey</h1>
 		  </div>
           <div class="pull-right">
-			 <a href="#" id="bannerRight"><img src="/images/logo.jpg" | prepend: site.baseurl }}?{{ site.time | date: "%Y%m%d%H%M" }}"  alt=""/></a>
+			 <a href="#" id="bannerRight"><img src="{{ "/images/logo.jpg" | prepend: site.baseurl }}?{{ site.time | date: "%Y%m%d%H%M" }}"  alt=""/></a>
 		  </div>
           <div class="clear"><hr/></div>
         </div>