Java Script Error

fiona2412

I'm using a java script on my site for pop up boxes, i've got one with an error, but i can't see anything wrong in the way i've written the code, it's exactly the same as the others on the page. i can't add links yet as i haven't made the required amount of post's but if you follow the my site link in my signature, go to Favourite Tutorials the 2nd to last image (what's your problem), when you click on it you should get a pop up box displaying the full image but it doesn't work. It's say's error at the bottom. All the other images on the page work, it's just this one :banghead:

I really don't know what to do or what I have done...can anyone help?

Thanks in advance

Hugs
Fiona
xoxo