CSS Rollover Problem in IE Options

[fainaru]

I'm having some trouble getting the Rollover to work in IE. Whenever I hover on it, it moves and if you slide it, the rollovers don't stay in one place and shift up/down. It works fine in Firefox.

Here's my code

div.nav a
{
display: block;
padding: 5px;
width: 150px;
background-color: #31495D;
margin-bottom: 3px;
text-align: left;
}

div.nav a:link,.nav a:visited, div.nav a:active
{
display: block;
padding: 5px;
width: 150px;
background-color:31495D;
text-decoration: none;
margin-bottom: 3px;
}

div.nav a:hover,
{
display: block;
padding: 5px;
width: 150px;
background-color:000000;
color:485A68;
text-decoration:none;
margin-bottom: 3px;
}

.nav { background-color:transparent; overflow:auto; width: 150; position:absolute; z-index:2; left:65%; top:0%; margin-left: -30px; margin-top:480px; text-align:left; visibility:visible;}

Thanks in advance.