url history tracking

[Anon]

Hi guys n gals.
I have to find a way to track if the hits on my site came from a certian link on another site or not. The link will be on an add banner. can I pass a parameter in the link and then recognize it on my side using php or javascript?

[Anon]

....yourpage.com?from=thisite">etc</a>

if($_POST[from]){
//log to DB or whatever//
}

or if you can not get alter the banner...

$url=@parse_url($HTTP_REFERER);
if($url[host])!="www.my_domain.com"){
some_logging_function($HTTP_REFERER);
}

note that you wont 'always' be able to get the $HTTP_REFERER