Stop a postback in javascript

Question

i have an ASP webform with a JQuery Thickbox, i have an image that opens the thickbox when user click.

once open the thickbox it shows me a grid with several rows an

Answer 1

How I do it; How I've done it:

Columns too small?

The "return false" stops the postback of the server control after the javascript function executes. Very useful.