add addScript() function for loading JSON scripts (or any scripts, for that matter)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@984 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Ajax.js

@@ -106,3 +106,13 @@ OpenLayers.parseXMLString = function(text) {
 
     return ajaxResponse;
 };
+
+/**
+ * @param {String} url
+ */
+OpenLayers.addScript = function(url) {
+    var head = document.getElementsByTagName("HEAD")[0];
+    var scriptElem = document.createElement("script");
+    scriptElem.src = url;
+    head.appendChild(scriptElem);
+};