Converting an image to Black & White?

On my photography web site, I would like to know how I can allow someone to click a button to view a photo black and white.

 

You can do that with filters (IE only) or using a peace of PHP script using the following function function.imagecopymergegray.php

 

Hmm, just Googled that, and found a bit of info, not too sure how to use it tho.

 

You need to create a little PHP script that converts the images to grayscaled images.. that's all..

 

Here u goo http://php.about.com/od/gdlibrary/ss/grayscale_gd.htm