asp .net web control library + java script function?

I've got a web composite control library project and I would like to add a button which runs a java script function when it is clicked. i.e. "onclick"
I'm not sure where/how to add the java function block. A web user control file i.e. ascx allows you to view the HTML section to add script however for a web control library the file is of type .vb.

Any ideas?

This is how to add a onClick JS to a button.

In the Page load event:

VB Code:

If Not IsPostBack Then
   btnClickMe.Attributes.Add("onClick", "alert('Woof!');return false")
End If

The return false on the end means that clicking the button does NOT cause a postback to the server and therefore the VB.NET button click event doesn't fire.
Woka