Fixing JS error/Docker 1.13>17.03

Author: johndmulhausen

_includes/global-header.html

@@ -89,7 +89,7 @@ <h1>Docker's Documentation</h1>
             <div class="ctrl-right">
               <div class="btn-group">
                   <button type="button" class="btn btn-default dropdown-btn dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-                                    Docker 17.03 (current)<span class="caret"></span>
+                                    Docker 17.03 (current) <span class="caret"></span>
                   </button>
                   <ul class="dropdown-menu">
                     {% for item in site.data.docsarchive.docker-compose %}

_includes/header.html

@@ -32,7 +32,7 @@
                 <a href="javascript:void(0)" id="menu-toggle"><i class="fa fa-indent" aria-hidden="true"></i></a>
                 <div class="btn-group">
                     <button type="button" class="btn btn-default dropdown-btn dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-                        Docker 1.13 <span class="caret"></span>
+                        Docker 17.03 (current) <span class="caret"></span>
                     </button>
                     <ul class="dropdown-menu">
                         {% for item in site.data.docsarchive.docker-compose %}

_layouts/docs.html

@@ -168,9 +168,9 @@ <h1>{{ page.title }}</h1>{% endif %} {% if page.advisory %}
 					<script language="javascript">
 					// ensure that the left nav visibly displays the current topic
 					var current = document.getElementsByClassName("active currentPage");
-					if (current) {
+					if (current[0]) {
 							var container = document.getElementsByClassName("sidebar");
-							if (container) {
+							if (container[0]) {
 								current[0].scrollIntoView(true);
 								container[0].scrollTop -= 150;
 							}