I've inserted google ads into single.php and notice that in Firefox the Google Ads move slightly up and down while scrolling. This is very annoying while browsing. However, this does not happen in Internet Explorer.
This person here described the issue back in 2005, but he didn't find a solution. I've looked around and couldn't find it either.
"I have google ads on two places of my site and in both places when a user scrolls up and down with their wheel mouse, the google ads shift up or down and when they shift up a white space shows up on the bottom of the ads. This only happens in mozilla and not ie. Does anyone know how to fix this problem? My google ads are not in frames."
This is the code in the single.php:
google_ad_client = "pub-.......";
/* top ad */
google_ad_slot = ".......";
google_ad_width = 728;
google_ad_height = 90;