+<div id="zoomArea" class="overlayArea">
+<input type="button" id="zoomInButton" value="+"
+ onclick="zoomIn();"><br/>
+<span id="zoomLevel">Z</span><br/>
+<input type="button" id="zoomOutButton" value="-"
+ onclick="zoomOut();">
+</div>
+
+<div id="fullscreenArea" class="overlayArea">
+<!-- other possible characters: ◰ -->
+<input type="button" id="fullscreenButton" value="▣"
+ onclick="toggleFullscreen();">
+</div>
+
+<p id="debug" class="debugHide"></p>
+<p id="copyright" class="overlayArea"></p>
+