You need to know what the index for their code is for that particular variable or send a bogus HTTP_REFER (depending on how their site is coded)... But, basically, what you are asking is for us to tell you how to inject variables into someone else's script. That's not a safe practice, and hopefully that site is smart enough to prevent you from injecting any variables, because in theory, it could be malicious... What you need to do is contact the site owner, and find out how to get what you want from their site.