Linking code question

[nomad]

Hi y'all

What's the difference between these two linking codes?

http://www.adultrevenueservice.com/re.php?s=BYOT6717&a=XXXXXXX&b=&cen=&t=5&nofilter=&x=1&c=FREE

http://www.adultrevenueservice.com/re.php?s=BYOT6717&a=XXXXXXX&b=&t=10&nofilter=&x=1&c=FREE

What do these extra characters in the first link stand for "=cen="?

Thanx
Teebs

[ronnie]

Why not ask ARS? If any one would know. Often it is explained on the sponsors site.

ronnie