I'm having difficulty getting a Pop Up Window to work

[Ocean]

Hi!

I'm having some difficulty getting a link to open a Pop Up Window.

Here's what I'm using:

 
This is the Regular Link:
 
(<a href="showthread.php?$session[sessionurl]do=testaction&amp;t=$threadid">Execute Test Action</a>)
 
 
This is what I'm trying to modify it to, in order to get it to open in a Pop Up Window:
 
(<a href="#" onclick="showthread.php?$session[sessionurl]do=testaction&amp;t=$threadid; return false;">Execute Test Action</a>)
 
 

Obviously, I'm making a mistake. Can someone help me figure out what I'm doing wrong?


Thanks!