Can anybody please explain this policy. I am quoting from Google AdSense site "What special ad implementations are permitted by your policies? Generally, altering the behavior or targeting of AdSense ad code is prohibited. However, publishers are permitted to use scripts which allow users to close the ad unit by clicking on a box. Also, to allow scrolling, publishers may place ads in a static frame while the primary content of the site is in a secondary frame" CAN YOU EXPLAIN WHAT IT MEANS WHEN THEY SAY "However, publishers are permitted to use scripts which allow......." Thank you