I'm starting up a new Pligg-based site, and I really need a way to expand long submissions directly onto the front page.

Like. Read the short intro, if you want the article, click: read more, and the rest of the submission magically shows up, shoving everything under the article down to make space for it.

If you've used the new Slashdot discussion system, the "read more" functionality that appear at the end of very long comments is exactly what I have in mind.

To clarify: I'm not looking for a system to pull external articles into my system, just to display the rest of whatever the submitter wrote - if it's longer than what's displayed by default.