Challenging problem

[bUcKl3]

I have a problem and i havent got any clue as to how am i going to solve it..with headers? sessionid? i dont know.

I wanna build something that goes like this.

1. user clicks on a link which open up the script i'm making
2. the script will show another link target _blank to a voting site.
3. user will click on the link to open the voting site and vote.
4. after the user vote, the vote.php page of that site will redirect to thankyou.php.
5. my job here is to use the script i've done in #2 to sniff out whether has the voting page been accessed and redirected to thankyou.php.

Is there a way to do it?