Yeah it kinda complicated, i tinker WAAYYY too much with my site......lol
with the paypal button, you can set it for a certain amount and plop it onto your ad page, and that works fine and dandy, no problem.
>I< wanted to be able to track my advertisers thru the built-in vB subscription process and be able to show advertisers in a usergroup, etc. so i basically stole the paypal button image and in the HTML i made it link to my payments.php which gives your advertising options, looks like this
Attachment 999
see you got the different amounts for different spots. if someone pays like that it automatically plops them in the advertisers group and also makes it easy for me to see when their ad time is up. Advertiser group info
HERE
kinda complicated, but it works for me, and the 10 months shown on bottom of payment drop-down i have to take off, i had a person pay for 10 months of advertising as a lump sum and left it on there....