How can I by using the FormHelper ,or some other method, render an image link that runs javascript when clicked?

Programmer Question

Background:

I want to render this:

in a cakephp app. Note: this link is not associated with a model at all, it's just part of a form going off-site.

I'm unsure of how to proceed: I've seen this on the cakephp site, but
with all that goes on in cake, I'm not sure about the whole javascript calling business. What's the best way to create such a thing?

Find the answer here