This script works well and allows you to specify up to 3 friends to send a link to your website to. Instructions are clear (simply upload the php file and use an include). Although the script works well I encountered a problem when I wanted to validate my original page where I used the script. If you want your pages to validate, you will need to adjust the script slightly so all , , and elements sit within the php code, so your pages won't have these tags appearing twice.