[Seaside] Script in head tag

[Sebastian Sastre]

Hi there,

In updateRoot: we don't have the canvas. Beside the script element which invokes
a file of a javascript library, how do I add a script with actual javascript
code there?

Sebastian 
PD: not good idea for regular code but a good one for initialization code like
the one provided by google with:
google.load('prototype','1.6')
google.load('scriptaculous','1.8')
(see: http://code.google.com/apis/ajaxlibs)