[TYPO3] plain HTML doesn't allow javascript?

[dieter orens]

I try to add 'onclick' events to links using the 'plain html' element, 
but this doesn't seem to work, is that correct?
I include my script like this:

page.headerData.4 = TEXT
page.headerData.4.value (
<script language="JavaScript" src="fileadmin/js/styleswitcher.js" 
type="text/JavaScript">
</script>
)

Any help?