Javascript problem

[damagedmafia]

hi i have recently got a java script error problem

heres a screenshot
http://www.picsaway.com/uploads/screenshot-d772891af1.png (http://www.picsaway.com/view/screenshot-d772891af1.png)

how do i get rid of this

and im looking at doing myself a javascript webpage and i want to know what browser is best speed and efficiancy wise

[llamabr]

This error is on the server side.

Firefox is the best for testing, though if you're a professional, you know you need to test in ie as well.