HTTP referer (originally a misspelling of referrer) is an HTTP header field that identifies the address of the webpage (i.e. the URI or IRI) that linked to the resource being requested. By checking the referer, the new webpage can see where the request originated.
Just add a questionmark to the URL of this site and add your URL - that's all. Or use the script below.
This is an example link to google
Please note, that you have to change your.domain to your actual domain.
if you want to add more exceptions just add && !hrefer.macht("exception") to the line