Overflow: visible?

1

I thought overflow:visible would work but it doesnt.

Basically I want firefox to look like IE on the right.

I would provide a link, but the site is password protected for now. Here is my CSS for the menu that you see in the image


.vertical ul{
	list-style-type: none;
	padding: 0px;
	margin: 0;
	/*border-top: 1px solid;*/
	width: 165px;
}
.vertical li a{
	/*display: block;
	overflow:visible;*/
	width: 165px;
	text-decoration: none;
	height: 1em;
	padding: .1em 1px;
	border-bottom: 1px solid #666666;
	/*border-top: 0px;*/
}
.vertical li{
	/*Needed for IE. Don't ask me why, It was a lucky guess.*/
	display: inline;
}
.vertical li ul{
	position: absolute;
	margin-top: -1.3em;
	margin-left: 165px;
}