php - Yii Custom Widget

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I am trying to create a Yii widget
that will generate Google Charts
(http://code.google.com/apis/chart).

How do I
make a widget that writes code in both the html headers (where the javascript includes
and stuff will be), and in the html body?

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class="normal">Answer

I found my
answer:

Yii::app()->clientScript->registerScriptFile()

and

Yii::app()->clientScript->registerScript()