Adhoc javascript on an end form ?

Hi,
Following are the steps to achieve this :
Create an EndFormSession Form and Insert a Start Flow button into it.
In the properties -> Create a Flow and add a simple form containing a button on it.
Run the Main flow containing End Form Session.
When you click on the Start Flow button, it will open up the form containing the Flow and clicking on the button on the form will lead to EndFormSession again.
Thank you.