I've had this problem before too. I found that it was Dreamweaver's fault. I used it to upload my page with the iRite custom toolbar included and selected upload related files, but it had missed out the JS files for the custom toolbar.
I simply had to select the files manually and upload them via ftp and that fixed my problem. Might be worth checking they've actually been uploaded for you too. They'll be in the custom folder within the iRite folder.