Voluum multi-offer page with organic traffic (3)

So my campaign is set up with a multi-offer lander. The offer links (such as mycname.mydomain.com/click/1) work if and only if the campaign link was clicked prior to
entering the website. The thing is, I'm interested in these offer links to work also when there's organic traffic. Is there a way to include a pixel or something that will make them work either way?

One way that I found works was suggested by @caurmen grabbing the Voluum parameters from the querystring and setting a cookie.

When creating the link for the offer simply check if the cookie is present, if so then use Voluum link.

Otherwise use a direct link etc.

Here is the link to the thread (from comment #58):

http://stmforum.com/forum/showthread...This-Now/page2

Here's what we do when you don,t have too many offers (1-3):

1. Setup campaigns, 1 for media buying and X organic campaigns (1 for each offer).
2. On LP detect if voluumdata is empty (with php), if empty display organic campaign url.

<?php
if (isset($_GET["voluumdata"])) {
$offer1 = "http://trk.traking.com/click/1";
$offer2 = "http://trk.traking.com/click/2";
$offer3 = "http://trk.traking.com/click/3";
} else {
$offer1 = "http://trk.traking.com/n38t9ygfg-38b7-4yhg-g45g-9i059a31c7ce"; //Voluum organic campaign 1
$offer2 = "http://trk.traking.com/n38t9ygfg-38b7-4yhg-g45g-9i059a31c7ce"; //Voluum organic campaign 2
$offer3 = "http://trk.traking.com/n38t9ygfg-38b7-4yhg-g45g-9i059a31c7ce"; //voluum organic campaign 3
}
?>

<a href="<?php echo $offer1; ?>" target="_blank" rel="nofollow">LINK</a>