Pop Up Boxes not popping up

[Chop]

Im using a CSS based pop up code that makes a text box pop up when you scroll over a link.In IE, on this page ( http://yourmodular.com/plans.htm ), the pop ups dont show up and the code messes up the layout. However in Firefox, it is fine and everything pops up like it is supposed to. What is going wrong here?The CSS code

}a.navText3 {	font-family: Arial, Helvetica, sans-serif;	font-weight: normal;	color: #000066;	font-size: 12px;	line-height: 24px;	letter-spacing: 1px;	text-decoration: none;	text-align: center;		position:relative;		z-index:24;}a.navText3:hover{z-index:25;	text-decoration:none;}a.navText3 span{display: none;}a.navText3:hover span{	display:block;	position:absolute;	top:2em; left:2em; width:25em;	border:2px solid #3D4C73;	background-color:#A79361;	color:#000066;	text-align: center;}

And heres how it's inserted into the HTML

<a href="link" class="navText3">Link Name<span>Textbox</span></a>

Please help