I need to be able to make my links expire if the user has already completed my offer, cookie tracking i think will do it, this way i won't get duplicated submissions.
does any one know of such a script to do this?

I know... Memorial Day Weekend I should get a life.....
BHW you are my life!! LOL.
Enjoy the weekend guys/gals

Well I can write you a script if you want. $10? :P

sure ad me to skype and we'll talk about it more