Referring to a variable from a URL

[idgeoman]

Newbie here 🙂 I have successfully added a variable to a URL. The resulting URL looks like this...

...#control=Animals_Detail%202&uid=c4ba98f6&page=detail 

On the resulting page (Animals_Detail 2) I have an action that I want to add "uid=c4ba98f6" onto the end of. How do I reference the variable uid and it's value in an action?

[idgeoman]

For the record, this doesn't work...