Hi,
Are you working in a live server? What is your website url where the problem occurs? Without seeing your website i can't help you. Maybe you made a mistake during installation, or maybe there is a jquery conflict on your website. It is hard to say what is wrong.
Or - email me your FTP credentials & Joomla admin account to This email address is being protected from spambots. You need JavaScript enabled to view it. and let me install the zoomEffect to your website. I will make everything ready to go for you.