In a previous posting I mentioned modifying the pflow.js file in order to add a custom JavaScript function for use within your flow (http://consultdavidw.blogspot.com/2007/07/processflow-custom-functions.html) but with ProcessFlow Designer 9.x you can now add a JavaScript Function within your flow.
Within the Assign node properties, click the Add JavaScript button and the JavaScript Expression Builder will open allowing you to add your custom function.
Of course the advantage to using pflow.js for your JavaScript functions is that they're available to all of your flows but if you just want a quick custom function then this new feature may be the way to go.
