Thanks, Geshan! For the moment, I'm going to leave my teasers as they are; they seem oddly fragile on this site (not on other sites I work with), and as long as they're more or less behaving, I'm loathe to touch them further. : )

But for some sites, the advanced method you describe could be fantastic. I'm definitely bookmarking this one, and will add a link to my Drupal Resources page.