Pop up Information windows D7
I am not aware of a contrib module to achieve this, but you can always use jQuery in your theme or custom module.

Something like this might work (not tested, but that's the main idea - out of scope for Drupal Answers):

jQuery(document).ready(function() {
  // on link click (jQuery 1.4)
  jQuery('#my-link').click(function(e) {
    // preventDefault otherwise browser will go to link
    e.preventDefault();
    // show the pop-up layer which is assumed hidden with css or sth.
    jQuery('#my-popup-layer').fadeIn();
    // here you can possibly chain up more actions in order to 
    // update the contents of the pop-up
    // now delay 3sec
    jQuery(this)
      .delay(3000)
      .queue(function(next) {
        // redirect
        window.location.href = jQuery(this).attr('href');
        next(); // prob redundant
      });
  });
});