Even i am also trying to get the same thing but it seems there is no option for that.
Unless you really need a "button" (with states, etc.), don't bother.
Make the text frame a HyperlinkPageItemSource and create a hyperlink...
Could you please help me out with a script to perform that task?
I'm current using JS on CS2.
I need to add a hyperlink to several text boxes that are anchored in text.