I am trying to create Web Collect forms by creating landing pages in Cloud Pages.  I am using Web Collect code I obtained from the Salesforce Web Collect doc (see below). 

I am able to get the unsubscribe/subscribe functions to work properly, but I cannot get it to redirect to a different webpage or to display a "Thank you for your submission" message.  

When the form is submitted, it automatically redirects to http://etweb.exacttarget.com/app_thankyou.aspx.  That website does not function, however, and just gives the message "This site can't be reached."

How can I get the Web Collect form to display a Thank You message and/or redirect to another site?

Web Collect Code Samples