Going to the link you sent, it looks like you are trying to run some jQuery code before you have the jQuery include on the page. This doesn't look like a conflict with PowerGallery. If you are running 1.1.1, then it already has the fixes to allow both libraries to co-exist.
I would recommend using Firebug for Firefox or the Chrome dev tools to troubleshoot your issue. The JavaScript console will tell you exactly where the error is occurring.
-justin