cache the result of the OpenLayers._getScriptLocation function. r=ahocevar (closes #2389)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9935 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers.js

@@ -17,6 +17,12 @@
      */
     var singleFile = (typeof OpenLayers == "object" && OpenLayers.singleFile);
     
+    /**
+     * Cache for the script location returned from
+     * OpenLayers._getScriptLocation
+     */
+    var scriptLocation;
+    
     /**
      * Namespace: OpenLayers
      * The OpenLayers object provides a namespace for all things OpenLayers
@@ -37,7 +43,10 @@
          * {String} Path to this script
          */
         _getScriptLocation: function () {
-            var scriptLocation = "";            
+            if(scriptLocation) {
+                return scriptLocation;
+            }
+            scriptLocation = "";            
             var isOL = new RegExp("(^|(.*?\\/))(" + OpenLayers._scriptName + ")(\\?|$)");
          
             var scripts = document.getElementsByTagName('script');