[Rails] calling an action on mouse over of the link_to in rails

Hi ,

i am very new to rails.
I am having a link like

<%= hcard_link_to_user h(@blog.user.fullname), @blog.user, :class =>
"underline" %>

I am trying to call an action on mouse over of this link how to do that
..

Please give suggestions.

Aruna.

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