Since I just upgraded to jQuery 1.3.1, I just discovered the following: in Opera 9.63, when you add new html via jQuery, Opera adds the new tags in capitals. For instance, if you have:
$("div").html("<img src='foo.png' alt='foo'/>"); Then in Opera, this will be added as <IMG src='foo.png' alt='foo'/>. I just discovered that jQuery 1.3.x is now case sensitive in some areas that jQuery 1.2.x was not, so if you use a selector like "img", you might not match IMG in Opera. Hope this will help others. Cheers, Greg.