centrar pagina web en todos los navegadores

[diapos_e]

Hola de nuevo,

Despues de vuestros consejos me he puesto a leer un poco en internet, y he hecho cambios. La unica cosa que no consiguo es centrar las imagenes de la galeria con el Diapos Estudio y el menu.
[URL="http://tufotografoenibiza.com/arquitectura3.html"]http://tufotografoenibiza.com/arquitectura3.html[/URL]

Os dejo una parte del css


#arquitectura1 {
position:absolute;
top:150px;
margin: 0 auto;
width:433px;
height:650px;
z-index:8;
visibility:visible;
}
#arquitectura2 {
position:absolute;
top:180px;
margin: 0 auto;
width:433px;
height:650px;
z-index:9;
visibility:hidden;
}
#arquitectura3 {
position:absolute;
top:150px;
margin: 0 auto;
width:650px;
height:433px;
z-index:10;
visibility:visible;
}

#marquitectura1 {
position:absolute;
margin-left:340px;
top:173px;
width:80px;
height:80px;
z-index:15;
background-color: #666;
visibility: visible;
}
#marquitectura2 {
position:absolute;
margin-left:440px;
top:173px;
width:80px;
height:80px;
z-index:16;
background-color: #666666;
visibility: visible;
}
#marquitectura3 {
position:absolute;
margin-left:340px;
top:276px;
width:80px;
height:80px;
z-index:17;
background-color: #666666;
visibility: visible;
}

body {
background-image: url();
background-color:#FFF;
text-align:center;
}
a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
text-decoration: none;
}
a:active {
text-decoration: none;
}
body,td,th {
font-family: Verdana, Geneva, sans-serif;
color:#666;
}
a {
font-family: Verdana, Geneva, sans-serif;
}
p.ex1
{
text-align:center;
font-family:Verdana,Helvetica,Swiss;
font-size:11px;
color:#B7B7B7;
text-decoration:none;
}
p.menu
{
text-align:center;
font-family:Verdana,Helvetica,Swiss;
font-size:12px;
color:#888888;
text-decoration:none;
}

#arquitectura {
float:center;
top:188px;
width:160px;
height:160px;
z-index:22;
visibility: visible;
}

#books {
align:center;
top:188px;
width:160px;
height:160px;
z-index:56;
visibility: visible;
}
#eventos {
align:center;
top:280px;
width:160px;
height:160px;
z-index:57;
visibility: visible;
}
#restauracion_imagenes {
align:center;
top:280px;
width:160px;
height:160px;
z-index:58;
visibility: visible;
}

#div.container
{
text-align:center;
width:100%;
margin: 0 auto;
border:1px white;
line-height:150%;
}

#thumbnail
{
position:absolute;
top:100px;
width:130px;
margin-left: 10px;
border-left:0px solid gray;
padding:0;
}
#es {
position:absolute;
top:99px;
z-index:6;
visibility: visible;
margin-left: 400px;
}
#en {
position:absolute;
top:101px;
z-index:7;
visibility: visible;
margin-left: 435px;
}

a
{

width:12%;
text-decoration:none;
color:#505050 ;
background-color:white;
padding-top:0.3em;
padding-bottom:0.3em;
padding-right:0px;
padding-left:0px;
margin:0px;
}
ul
{
text-align:center;
top:12px;
width:100%;
padding:0px;
margin:0px;
list-style-type:center;
font-size:small;
color:#999999;
font-family:Verdana,Helvetica,Swiss;
padding-right:0px;
padding-left:0px;
}

li{text-align:center;display:inline;}
a:hover {background-color:white}
a.title {background-color:white}

.input {
text-decoration: none;
font-size: 11px;
font-family: Verdana,Helvetica,Swiss;
color: #000000;
background-color: #FEFEFE;
border: 1px solid #999;
border-color: #CCCCCC;
scrollbar-face-color:#EEEEEE;
scrollbar-arrow-color:#666666;
scrollbar-track-color:#FFFFFF;
scrollbar-shadow-color:#AAAAAA;
scrollbar-highlight-color:#FFFFFF;
scrollbar-3dlight-color:#888888;
scrollbar-darkshadow-Color:#888888;
}
div.titulo
{
text-align:center;
text-decoration:none;
letter-spacing:2.8px;
margin:0 auto;
clear:left;
font-size:22px;
font-family:"Trebuchet MS",Tahoma,Arial,Helvetica,Verdana;
color:#333;
background-color: #FFFFFF;
z-index:3;
}
div.gallery {
position:absolute;
float:left;
margin:0 auto;
}
div.footer {
text-align:center;
margin-top:300px;
font-family:Verdana, Geneva, sans-serif;
clear:both;
font-size:12px;
z-index:59;
visibility: visible;
vertical-align:bottom;
}

Les agradezco si le echariais un vistazo :)

Saludos