Enable use of "use strict" and fix two global variable declarations

js/base.js

@@ -4,6 +4,8 @@
 // This file should be used only for javascript code
 // necessary for all pages to work properly.
 
+"use strict"
+
 function addEvent(a, b, c) {
 // Attach event to a DOM node.
 // Ex. addEvent(node,'click',function);

js/devsearch.js

@@ -19,6 +19,8 @@ Nested loops below:
 
 {% endcomment %}
 
+"use strict"
+
 var search_data = [
 {% for list in site.devsearches %}{% for item in list %}
 {% if forloop.first %}{% capture category_name %}{{item}}{% endcapture %}

js/events.js

@@ -1,6 +1,9 @@
 ---
 layout: null
 ---
+
+"use strict"
+
 var zoom=2;
 var minzoom=1;
 if(isMobile())var zoom=minzoom=0;

js/ie.js

@@ -1,6 +1,8 @@
 // This file is licensed under the MIT License (MIT) available on
 // http://opensource.org/licenses/MIT.
 
+"use strict"
+
 function pngfix(){
 //Allows IE6 to render transparent png
 var arVersion = navigator.appVersion.split("MSIE")
@@ -38,7 +40,7 @@ if ((version >= 5.5) && (document.body.filters))
 }
 
 //Let other scripts know browser is IE6-7
-legacyIE=true;
+var legacyIE=true;
 
 //Render all transparent pngs
 window.onload=pngfix;

js/main.js

@@ -4,6 +4,8 @@
 // This file is used for javascript code
 // necessary for some pages to work properly.
 
+"use strict"
+
 function getWidth(a) {
 // Return the integer value of the computed width of a DOM node.
 // Ex. getWidth(node);
@@ -189,6 +191,7 @@ function updateToc() {
 var pageoffset;
 var windowy;
 var toc;
+var fallback;
 var first;
 var last;
 var closer;