Probably, but... why?
I'll assume when you say the link fails you mean it goes to a different page. I think CYScript has a way to do randomization and all you really need is to add a link based on a variable that you randomly set to 1 or 2. One of those links leads to the "success" page, the other leads to the failure page, and both should look the same. I don't know offhand what that script looks like.