Expiring Pixels

Can you guys help? I have loaded and beeen running million dollar script and overall happy. The problem I have is when site was set up pixels were set to expire in 3 days and then 30 days.

1. Now I have almost finished loading website I cannot change expiry date so all pixels never expire in code. Can someone help me work out where to change code to fix problem as loading 80+ pixels will be a nightmare.
2. Is there any way when you hoover over image or removing the http extention link in the code?
3. Is there any way of using my url rather than website I wish to link to in URL. If anyone can help with any of these problems it would really ba appreciated.