Drop down menu help needed

Hi everyone. I’ve been trying to make a drop down menu for my website. I used a tutorial on kirupa.com for making drop down menus and when i finished my own version, it wouldn’t even drop down. it wouldn’t do anyhting when i rolled over it. the address to the tutorial is http://www.kirupa.com/developer/mx/dropdownmenu.htm. my version is attached… please help me if u can to make it work.