51243 Hotlink Protection

Hi, iam looking for someone who can help me to protect my (video)files against hotlinks. I use 2 servers for my website. One hosts the mainpage and the second is the media-download-server. User of my website should see the videos only in a normal php-page as a webstream but some of them just copy the link out of the php-page and post the URL in forums and other crap. I would like to get some script that changes the URL every 2-4 hours or something like "a hidden directory". Hotlinkers should be redirected to my mainpage. Please no cookie based scripts. Other ideas are welcome! Job should include: -Script writing / Installation -Support for a few days after installation.