Images in google images leading to webpage

I have noticed, some images on google which you click on to maximize, will lead directly to a web pageas oppsoed to the larger image.
Firstly, how is this done?
And secondly, if you have lots of images indexed in google images, is it worth doing this?

 

I get most of the search engine traffic from google images. I guess its simply a forced reload (redirect) of some sort. Shouldn't be too hard to figure out, although I fail to see the point.

 

by Frames - Frame is using the "redirect header" too.

 

Ah right...as simple as that. Thanks.

 

1. It is done by adding code like this to your page. This is a break out code, so once they click on the little thumb, they go straight to my site.

"<script language="javascript" type="text/javascript">if (self != top) { if (document.images) top.location.replace (window.
location.href); else top.location.href = window.location.href;}</script>"

I didn't write it and have no idea how it works. I found it, plopped it on my sites, and it works.

2. Yes it is worth doing. To be honest, I have no idea why so few webmasters do SEO for google images. I have many sites that get 70% or more of their traffic from image searches.

That is all I have to say about that.