Submenu getting cut off/hidden

Replies: 0

The submenus for this site are getting cut off at the border of the content area. How do I prevent this?
http://nextlevel.pairserver.com/

I tried raising the z-index of the submenu, but it did not affect it.

#header .header-links .sub-menu {
	display: none;
	float: left;
	position: absolute;
	z-index: 99999999; /*edit - original was 99999*/
	background: #FFF;
	border-top: 2px solid #E0484C;
	border-bottom: 1px solid #E3E3E3;
}

Is it the body-core code that is doing this perhaps?

body.layout-boxed #body-core, body.custom-background #body-core {
    max-width: 990px;
    display: block;
    margin: 0 auto;
    overflow: hidden;
}