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Help text in a component

Hey all,
I've an interesting issue. I have a VF page which contains a VF component. The VF page has some input fields which display their help text properly - when you roll over the icon the help text displays.
In the VF component, with the same surrounding tags, ie pageBlockSection, the help text icon displays, but the roll over doesn't work. The html look like:
<img class="helpOrb" src="/s.gif" alt="" title=""/>
<script language="JavaScript" type="text/javascript">
//sfdcPage.setHelp('Case.00NR0000000H8ay', 'Help text here');//

 which seems to have commented out the javascript rollover functionality for some reason!!
Why is this happening in the component???
Thanks for any help in advance