来自加载页面的Javascript响应未显示在中，尽管我可以在firebug中看到它

I'm loading a signup.php page into a div on my main page. All of the elements (forms/javascript etc) are working fine in the loaded page. The only issue is that once the php script returns the ajax response I cannot get it to show up on the div. I'm loading a signup.php page into a div on my