cleanup demo html pages

demo/show_own_source.js

@@ -1,3 +1,16 @@
-ace.require("ace/lib/net").get(document.baseURI, function(t){
-    editor.setValue(t, 1);
-})
+if (typeof ace == "undefined" && typeof require == "undefined") {
+    document.body.innerHTML = "<p style='padding: 20px 50px;'>couldn't find ace.js file, <br>"
+        + "to build it run <code>node Makefile.dryice.js full<code>"
+} else if (typeof ace == "undefined" && typeof require != "undefined") {
+    require(["ace/ace"], setValue)
+} else {
+    require = ace.require;
+    setValue()
+}
+
+function setValue() {
+    require("ace/lib/net").get(document.baseURI, function(t){
+        var el = document.getElementById("editor");
+        el.env.editor.setValue(t, 1);
+    })
+}