With a quick glance at the shurly code, I'd think this should work:

function yourmodule_shurly_redirect_before(&$redirect) {
  $redirect->destination = 'path/to/advert?somevar='. $redirect->destination; 
}

And then you need to set up you advertisement page as path/to/advert and have it redirect to $_GET['somevar'] after the timeout.

With a quick glance at the shurly code, I'd think this should work:

function yourmodule_shurly_redirect_before(&$redirect) {
  $redirect->destination = 'path/to/advert?somevar='. $redirect->destination; 
}

And then you need to set up your advertisement page as path/to/advert and have it redirect to $_GET['somevar'] after the timeout.

With a quick glance at the shurly code, I'd think this should work:

function yourmodule_shurly_redirect_before(&$redirect) {
  $redirect->destination = 'path/to/advert?somevar='. $redirect->destination; 
}

And then you need to set up you advertisement page as path/to/advert and have it redirect to $_GET['somevar'] after the timeout.

With a quick glance at the shurly code, I'd think this should work:

function yourmodule_shurly_redirect_before(&$redirect) {
  $redirect->destination = 'path/to/advert?somevar='. $redirect->destination; 
}

And then you need to set up you advertisement page as path/to/advert and have it redirect to $_GET['somevar'] after the timeout.