rules intergration with lightbox2

I am creating a page redirect rule that is triggered when someone adds a comment to a page.

What I want is a popup window to appear with the contents of the page the user is being redirected to after they add a comment. I need to use rules because the page the user is directed to is different for each instance.

I created the following:

Event: After saving a new comment
Condition: Node is of content type: basic
Action: Execute custom php code

$node_id = "69";
header( "Location: /node/$node_id/lightbox2");
exit;

When I run this code I get redirected to the following page.

http://www.mysite.com/node/69/lightbox2

However, lightbox2 does not engage. I thought I would need to add a javascript trigger or something to the code to make it work. However, I cannot find any code to do this.

Does anyone know what I am missing to make this work?