Ah! just added the following line!
CF.widget("AllOff","TAG","HOMEPAGE").executeActions();

So know the script looks like this:

onHold = function ()
{
CF.widget("TvOff","TAG","HOMEPAGE").executeActions(); \\ send IR
CF.widget("AllOff","TAG","HOMEPAGE").executeActions(); \\ jump to text page

};
onHoldInterval = 900

By inserting the "activity_ps_name" - the script works better - thanks Spudnic!

One more thing: The "AllOff" widget makes the pronto jump to a page showing a text to the user. Now, I only want this text screen to be shown some 10sec., and after that the HOME page most be shown. will I have to put in some delay code under "page_ps_name" in the page showing the text. How would that code looks like?