yeah it happens to a few people, its because the have a php banner on their site.... when some virus scanners detect that an image url is something like banner.php or logo.php they will flag it as malicious....n not really fair... but they did this because some site actually did run malicious scripts like that..... hopefully those scanners will come up with better ways of detecting things like this...
my scanner pick up on some peoples forum signatures that have an online count in it..... same thing... it's a php file.