3stlp. layout a obrazok v firefox

Ahojte mam problem s tym ,,blbym" firefoxom...

mam 3 stlpce a chcem cez css vlozit do stlpca v strede obrazok, ktoremu chcem dat relativnu poziciu. v ie a opere to bezi pekne, iba v firefoxe my to vyvadza pekne blbosti a neviem prist na to preco. Neviete kde by mohla byt chyba?

Web je tu:

http://www.adelka.netkosice.sk/web/index.php

a css:

/************** MAIN ***********************/
body {
font-size:80%;
font-family: Arial, "Arial CE", sans-serif, Helvetica;
color:#666666;
text-align: center;
background-color: #F4F2F4;
}

#stranka {
position:relative;
width:400px;
margin: 0 auto;
text-align: left;

}

/*********** LAYOUT ********************/
#up {
width: 400px;
height: 14px;
background-image: url(uni_up.gif);
background-repeat: no-repeat;
background-color: White;
}

#menu{
width: 400px;
height: 65px;
background-color: White;
}

#menu_left{
width: 110px;
height: 65px;
float: left;
background-color: White;
border-right: 2px solid #0092C5;
font-weight: bold;
text-align: right;
padding-right:15px;
padding-top: 2px;
line-height: 160%;
}

#menu_middle{
background-color: White;
height: 65px;
width: 100%;
padding: 0px;

}

#menu_right{
width: 110px;
height: 65px;
background-color: White;
float: right;
border-left: 2px solid #0092C5;
font-weight: bold;
text-align: left;
padding-left:15px;
padding-top: 2px;
line-height: 160%;
}



#sk_head{
clear: both;
width: 400px;
height: 112px;
background-image: url(sk_head.jpg);
background-repeat: no-repeat;
background-color: #0099CC;

}

#tube{
width: 400px;
height: auto;
background-color: White;
}

#tube_left{
width: 30px;
height: auto;
float: left;
background-color: White;
}

#tube_right{
width: 370px;
height: auto;
float: right;
background-color: White;
}

#down {
clear: both;
width: 400px;
height: 14px;
background-image: url(uni_down.gif);
background-repeat: no-repeat;
margin: 0;
padding: 0px;
}


/****************** MENU ****************************/


#bubles {
background-image: url("uni_bubles.gif");
height: 47px;
width: 66px;
position:relative;
top:0px;
left:0px;
background-image: no-repeat;
background-repeat: repeat-x;
}