Caching array length instead of accessing it with each iteration. r=crschmidt (closes #1636)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7627 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Console.js

@@ -220,7 +220,7 @@ OpenLayers.Console = {
      */
     if(window.console) {
         var scripts = document.getElementsByTagName("script");
-        for(var i=0; i<scripts.length; ++i) {
+        for(var i=0, len=scripts.length; i<len; ++i) {
             if(scripts[i].src.indexOf("firebug.js") != -1) {
                 OpenLayers.Util.extend(OpenLayers.Console, console);
                 break;