You either haven't uploaded all of the script files to the server or, the paths your page is using to find them are wrong. There could also be other problems. For lightbox, you need:
prototype.js
scriptaculous.js
lightbox.js
and (used by scriptaculous):
effects.js
Your page is looking for these here:
Code:
http://www.rachaeldunn.co.uk/prototype.js
http://www.rachaeldunn.co.uk/scriptaculous.js
http://www.rachaeldunn.co.uk/effects.js
http://www.rachaeldunn.co.uk/lightbox.js
It is finding them all at those locations except for:
Code:
http://www.rachaeldunn.co.uk/effects.js
The effects.js file comes with the lightbox distribution, upload it to that location.
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