Lightbox 2 error - please help :(

Hey guys,

Just been playing about with Lightbox and added it to the page:

It seems to work fine for me in IE 7 on my Windows Vista Ultimate machine, but wont load the images in Firefox at all.

Also I run another machine with Windows 7 beta on it and that wont do anything either and shows an error on the page.

Please help as this is getting rather frustrating now.