Validation after HREF link clicked

["Kent Hohlen" <khohlen@xxxxxxxxxxxxxxx>]

Is there a way to do some validation after the user clicks a link but before
the browser opens the link?

What I want to do is show a list of "items".  Each "item" has a link to a
detail view about that "item".  While the list is being built, I will flag
each "item" if the user is authorized to view the detail for each "item".
When the user clicks the detail link, I want to check the flag to see if
they are authorized.  If they are, show the detail, if not, show a message
box.

Is there a way a way for JavaScript or something else to be executed when
the link is clicked?

TIA.

Kent Hohlen
Eagle Window & Door