The way you do this is to code a 'Jump' in the ActionList of a widget and then issue 'executeActions' against the widget containing the jump. Be sure that you do this using ScheduleAfter as all scripts will end as soon as the Jump out of the activity is processed.

Here's an example to play with.

var w = CF.widget('GoHome','MyPage','MyActivity);
if (w)
CF.activity().scheduleAfter(10,function(x){try{x.executeActions();}catch(e){Diagnostics.log(e);}},w);

It is important to use try/catch here as you don't want to let any errors propagate out of your function as this could, in some cases, cause instability in the Pronto. It's not so much of a problem now as it was in earlier ProntoScript releases but it is always good practice to prevent errors from propagating out into the system from your own code.