lookto initial view

How to lookto the max fov? I have a cylinder pano and would like to return to the initial view , I mean to the view that the user sees when he enters the website.
Thank you

I used this like this:

<action name='home'>
  copy(hlookat,scene.hlookat);
  copy(vlookat,scene.vlookat);
</action>

and it did not change view at all.

But this is being working:

<action name='home'>
  lookto(0,0,.27,smooth(11,.1,11));
</action>

But the .27 value should be got automatically by a method or function.