Periodical and running a script

> Hello,
>
> I have a SUPeriodical set up as follows:
>
> html
>  script:
>    ((html periodical)
>        id: 'compositeGraph';
>        frequency: 5 seconds;
>        on: #renderNextImageOn: of: self)
>
>
> What I want is to run some javascript when the periodical is triggered.  For
> example, I would like the following javascript to be executed each time the
> periodical is triggered:
>
> html
>  script: ('document.getElementById("testDiv").src="new text";').
>
>
> I cannot figure our how to run the javascript code when the periodical is
> triggered.
>
> How do I do this?
>
> Thanks,
> Frank
>
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