Aide probleme IE vers Firefox css

Bonjour,

Je suis perdue car mon css fonctionne parfaitement sous IE mais pas du tout sous Firefox... Si vous avez une idée (je suis novice), je serai heureuse de l'avoir !

Voici mon code CSS

body

{

background-color: #000000;

}

a img {
border: none;
}

#conteneur

{

margin: auto;
width: 1024px;
position: relative;
}

#2bannieremenu

{

background-image: url("PSD/haut.png");

width: 1024px;
height: 233px;

}

#2corps

{
background-image: url("PSD/corps.png");
width: 1024px;
height: 499px;
color: #846b41;
font-size: 18px;
text-align: left;
padding-left: 0px;
padding-top: 15px;
display: inline;

}

#2bas

{

background-image: url("PSD/bas.png");

width: 1024px;
height: 37px;
color: white;
font-face: Arial;
font-size: 12px;
font-variant: small-caps ;

text-align: center;
padding-top: 7px;

}

#2corps a

{

color: #23b6f7;

font-size: 18px;

text-decoration: none;

}

#2corps a:hover

{

color: #85bb57;

font-size: 18px;

text-decoration: none;

}

#2bas a

{

color: #e4eeda;

font-face: Arial;
font-size: 12px;
font-variant: small-caps ;

font-weight:bold;

text-decoration: none;

}

#2bas a:hover

{

color: #a7bbc1;
font-face: Arial;
font-size: 12px;
font-variant: small-caps ;
font-weight:bold;
text-decoration: none;

}

a.rollover1 {
background:url('PSD/port1.png') no-repeat;
width: 225px;
height: 80px;
display:block;
position: absolute;
TOP:280px;
margin-left: 695px;
}
a.rollover1:hover {
background-position: bottom center;
}

a.rollover2 {
background:url('PSD/web1.png') no-repeat;
width: 225px;
height: 80px;
display:block;
position: absolute;
TOP:365px;
margin-left: 733px;
}
a.rollover2:hover {
background-position: bottom center;
}
a.rollover3 {
background:url('PSD/devis1.png') no-repeat;
width: 225px;
height: 80px;
display:block;
position: absolute;
TOP:450px;
margin-left: 772px;
}
a.rollover3:hover {
background-position: bottom center;
}

a.rollover4 {
background:url('PSD/accueil1.png') no-repeat;
width: 225px;
height: 80px;
display:block;
position: absolute;
TOP:535px;
margin-left: 810px;
}
a.rollover4:hover {
background-position: bottom center;

}

ul li{
position: absolute;
TOP:340px;
margin-left: 410px;
width:233px;height:193px;list-style:none;
}
/*permet de créer deux lignes*/
ul li:nth-child(4n){clear:left;}

ul li a{
display:block;overflow:hidden;
width:233px;height:193px;
margin-top:0px;margin-left:0px;
transition-property:width,height,margin,z-index,border;
transition-duration:0.4s;
}

ul li a:hover{
position:absolute;
width:292px;height:242px;
margin-top:-56px;margin-left:-56px;
z-index:100;
}

ul li a img{
position:absolute;
width:233px;height:193px;z-index:20;
transition-property:width,height,z-index;
transition-duration:0.4s;
}

ul li a:hover img{
width:292px;height:242px;
z-index:100;
}

Mon code html

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr" lang="fr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>

<title>Mon titre</title><style>A {text-decoration : none}</style>
<meta name="Author" content="Mon titre"><meta name="revisit-after" content="15 days">
<meta name="description" CONTENT="Mon titre">
<meta name="keywords" CONTENT="mots clefs">
<META NAME="Creation_Date" content="10-2012">
<link rel="stylesheet" media="screen" type="text/css" href="index.css"/>
</head>

<body>

<center>

<div id="conteneur">

<div id="2bannieremenu"></div>

<div id="2corps">
<ul>
<img src="PSD/cv2.png"></a>
</ul>
<ul>
<li>
<a href="https://www.google.com/?gws_rd=ssl" target="_blank">
<img src="PSD/loupe.png" alt="Agrandir et visionner mon C.V" />
</a>
</li>

</ul>

<a title="Merci de .." href="www.google.com"
class="rollover1"></a>
<a title="titres" href="web.html"
class="rollover2"></a>
<a title="Contact, faire établir un devis gratuit..." href="devis.html"
class="rollover3"></a>
<a title="Retour vers la page d'accueil." href="index.html"
class="rollover4"></a>

</div>

<div id="2bas">

<a href="mailto:xxx@aol.com">Me contacter (devis gratuit)</a> |
<a href="www.google.com" target="_blank">Télécharger mon C.V</a>

</div>
</div>

</body>
</html>

Merci par avance !!!!