Hi,
You could try a javascript popup window on your submit button and close it when the page loads.
eg
<BODY onLoad="newwindow.close()">
<input type="submit" onClick="window.open('newwindow.htm','newwindow','width=200, height=100')">
It does not actually confirm that the script is still running but can reassure a user if it is taking a long time.
Hope this helps
Mike