I ran into this problem while developing a jQuery plugin and was testing it on IE7 (don’t ask).
I was thinking… why the hell is IE running my jQuery code twice! I knew it was because i had an alert statement and it was being shown twice (the same document ready function firing twice). Then found out that this is a known bug for earlier versions of jQuery when used in IE the best fix is to update to the latest version.
Versions know to cause this bug:
See for more info on this version
Use latest version of jQuery: