Pb avec mon site sous mozilla et IE

Bonjour, mon fils m'a fait un site mais ça ne marche pas bien du tout. IL y a le fanfanloup sous le papillon qui ne s'affiche pas et les photos disparaissent enfin l'encadrement car la photo elle ne s'ouvre pas. sur la page des bagues qui est le 2° carré sur la page perle c'est flagran. au secours, de quoi ça vient. voici mon site
http://frouss2.free.fr/bagues.html c'est la page des bagues justement, il manque aussi le mot retour à coté du bouton bleu, je ne comprends pas car les 2 autres s'affichent bien.
merci pour votre aide
voici la page css des bagues
#logo
{
float:left;
background-image:url("papillon30.gif");
background-repeat:no-repeat;
margin-left:40px;
margin-top:-532px;
width:80px;
height:80px;
border:none;
}

#logo1
{
float:left;
background-image:url("logo_fanfanloup_text.png");
background-repeat:no-repeat;
margin-left:20px;
margin-top:-442px;
width:110px;
height:40px;
border:none;
}

#papillonmail
{
float:left;
background-image:url("email_animaux17.gif");
background-repeat:no repeat;
margin-left:19px;
margin-top:-20px;
padding:0px;
width:150px;
height:60px;
border:none;
}

body
{
background-image:url("fond fanfanloup.jpg");
background-repeat:no-repeat;
margin-left:auto;
text-align: center;
font-family: verdana, arial, sans-serif;
font-size: 0.7em;
}

#bt1
{
background-image:url("boutons/bt3.jpg");
background-repeat:no-repeat;
float:left;
margin-top:-260px;
margin-left:15px;
width:80px;
height:20px;
border:none;
}

#bt2
{
background-image:url("boutons/bt1.gif");
background-repeat:no-repeat;
float:left;
margin-top:-200px;
margin-left:15px;
width:80px;
height:20px;
border:none;
}

#bt3
{
background-image:url("boutons/bt1.jpg");
background-repeat:no-repeat;
float:left;
margin-top:-100px;
margin-left:15px;
width:80px;
height:20px;
border:none;
}

#email1
{
background-color:#ffd3fd;
}

#validnews
{
background-image:url("boutons/bt7.jpg");
background-repeat:no-repeat;
float:left;
margin-top:-36px;
margin-left:168px;
width:85px;
height:25px;
border:none;
}

#email
{
color:#e543bc;
margin-top:486px;
margin-left:-810px;
border:none;
}

#liencreation
{
background-image:url("liencreation.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-330px;
margin-left:20px;
width:130px;
height:40px;
border:none;
}

#lientricot
{
background-image:url("lientricot.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-210px;
margin-left:92px;
width:100px;
height:40px;
border:none;
}

#lienperle
{
background-image:url("lienperle.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-270px;
margin-left:92px;
width:100px;
height:40px;
border:none;
}

#lienretour
{
background-image:url("lienretour.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-110px;
margin-left:92px;
width:100px;
height:40px;
border:none;
}

#lientirets
{
background-image:url("lientirets.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-140px;
margin-left:18px;
width:260px;
height:30px;
border:none;
}

#bt1:hover
{
background-image:url("boutons/bt3.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-260px;
margin-left:15px;
width:80px;
height:20px;
border:none;
}

#bt2:hover
{
background-image:url("boutons/bt3.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-200px;
margin-left:15px;
width:80px;
height:20px;
border:none;
}

#bt3:hover
{
background-image:url("boutons/bt3.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:-100px;
margin-left:15px;
width:80px;
height:20px;
border:none;
}

#gallery
{
margin-top:-506px;
margin-left:630px;
}

.gallerycontainer{
position: relative;
width:360px;
/*Add a height attribute and set to largest image's height to prevent overlaying*/
}

.thumbnail img{
border: 1px solid #fdffbf;
margin: 0 2px 2px 0;
}

.thumbnail:hover{
background-color: transparent;
}

.thumbnail:hover img{
border: 1px solid #ff356a;
}

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
background-color: transparent;
padding: 5px;
left: -1000px;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 0px;
}

.thumbnail:hover span{ /*CSS for enlarged image*/
visibility: visible;
top: 0;
left: -446px; /*position where enlarged image should offset horizontally */
top:0px;
z-index: 50;
}

#logocomms
{
background-image:url("logo-postercommentaire.jpg");
background-repeat:no-repeat;
float:left;
padding:0;
margin-top:7px;
margin-left:210px;
width:240px;
height:40px;
border:none;
}