Horizontal navigation not working properly

My horizontal navigation is made up of a symbol. Inside the symbol has 5 buttons. When you mouse over a button it will show circle animation.

On each button, it has a script (e.g. email button has)
on (rollOver) {
gotoAndStop(“email”);
}

on (release) {
_level0.myMCL.loadClip(“email.swf”, 5);
}

when you click on the horizontal nav it works for the first 3 clicks then it doesn’t work. If you refresh the page, it will work for 3 clicks again. I am trying to resolve this problem so I can launch my website. So thank you in advance for helping me.

http://www.creativecrossing.org/flash2007/index.html