4
Do you mean something like a "slide" effect?
There are several ways of acomplishing this, here's 1:
This uses Jquery:
-Divide your text into a small intro and a larger main body.
-Place each one inside a separate div
-At the bottom of div 1 (with intro text) place a text link that says "read more".
-The bottom div (with main body text) will be hidden, when someone clicks on "read more", the the text will be shown using a "slide" effect.
Here's some of the jquery functions you need:
$.click
$.hide
$.show