Ajax does not tell if a username is okay or not

[deeceew]

I'm new to programming and I am using a restrict function to help validate user names and email addresses on my signup page. But when I enter text in the form fields, the ajax never finishes checking to tell me whether or not a potential username is okay to have. Filling out the form and submitting it does not get the page to change, load or anything else. When I check firebug I am told ReferenceError: ajaxObj is not defined. Does anyone know how to go about fixing this?

[Rabbit]

We would need to see the code.