Drop ArrangeScript into your WebArranger PlugIns folder. ArrangeScript adds an "Execute..." menu item to the WebArranger "Tools" menu. The Execute menu item attempts to compile and execute any text selected in a WebArranger note as AppleScript. With ArrangeScript installed, WebArranger can serve as a database of AppleScripts.
Building ArrangeScript requires the WebArranger SDK, available from CESoftware.