My .js script fail on IE7

Hi, Everyone

Currently I’m working on portfolio template project. The site is one page portfolio with cross-fade effect, slide show, and gallery. I use several jquery plugins to fulfill that purpose. The site is ready to go, but i found a problem. My script run smoothly on Firefox 6, Opera 11, Chrome, dan Safari 5. But my script won’t work on IE resulting messy look here and there. I don’t know where the error is. It seems IE can’t handle some of my script so the .js won’t load.
Could anyone help me to solve this problem? Here the link to the website:
http://under5hell.infiniteserve.com/

thanks.