problema css con ie8! help

[marisabru]

ciao ragazzi sto mettendo a posto questo sito :vacanzeincroazia.altervista.org/medist.html
vorrei che su explorer 8 funzionasse come su exp 9 o firefox cioè
il menu deve avere angoli arrotondato in alto a sx e dx
NON RIESCO A FARLO FUNZIONARE con nessun trick


qualcuno puo' aiutarmi per favore???


questo è il css del menu

/* menu */
.navigation
{
    float:left;
    width:100%;
    height:auto;
    top:108px !important;
   background-image:url('input_bg2.gif');
background-repeat: no-repeat;
border-radius:15 px
behavior: url(border-radius.htc)
}




.menu li 
{
    display:block;
    width:132px;
    float:left;
    height:50px;
    min-height:50px;
    background-image:url('li-bg.png');
border-radius: 5px;
    background-position:0px 0px;
    color:white;
}

.menu li:hover
{
    background-position:0px 53px;
}

.menu li:hover span
{
    color:#284c93;
}



.menu li a
{
    display:block;
    width:100%;
    float:left;
    text-align:center;
    font-size:13px;
    height:100%;
    text-decoration:none;
    color:white;
}

.menu li a span
{
    display:block;
    width:100%;
    float:left;
    text-align:center;
    font-size:13px;
    font-weight:bolder;
    margin-top:18px;
    text-decoration:none;
    color:white;
}

.deeper ul
{
    float:left;
    display:block;
    width:100%;
    height:0px;
    padding:0px;
    overflow:hidden;
    background-color:white;
    border-bottom-right-radius: 15px;
    border-bottom-left-radius: 15px;
}

.deeper ul li
{
    display:block;
    width:140px;
    float:left;
    height:30px;
    min-height:30px;
    color:white;
    background-color:white;
    background-image:none
}

.deeper ul li a
{
    display:block;
    width:100%;
    float:left;
    text-align:center;
    font-size:13px;
    height:100%;
    text-decoration:none;
}

.deeper ul li a span
{
    display:block;
    width:100%;
    float:left;
    text-align:center;
    font-size:13px;
    font-weight:bolder;
    margin-top:6px;
    text-decoration:none;
    color:white;
}

.deeper ul li:hover span
{
    color:#0096ff;
}

#item-680 ul
{
position:absolute !important;
top:200px !important;
right:187px !important;
width:132px !important;
height:auto !important;
background-color:white !important;
visibility:hidden;
border-radius:15px;
}

#item-679 ul
{
position:absolute !important;
top:230px !important;
right:187px !important;
width:132px !important;
height:auto !important;
background-color:white !important;
visibility:hidden;
border-radius:15px;
}

#test_bck
{
float:left !important;
width: auto !important;
min-width:100%;
background-image:url('bck_centrale.jpg') !important; 
background-repeat:repeat-x;
}

#shadow_menu
{
margin:auto;
width:920px;
height:32px;
background-image:url('bck_submenu.png') !important; 
}
 
.custom-banner
{
height:353px !important;
margin-bottom:-16px;
background-image:none !important;
}

.custom-blocks
{
background-image:url('separatore.png') !important;
background-repeat:no-repeat !important;
background-position:bottom center !important;
margin-bottom:15px;
}

.block
{
background-image:none !important;
}

#flashIntroPages
{
float:left;
width:600px;
height:100px;
}

.contact-address
{
    width:220px;
    font-size:15px;
}

.slogan
{
right:-70px !important;
}

#content
{
padding-top:0px !important;
/*
padding-bottom:0px !important;
min-height:100% !important;
*/
background-image:none !important;
background-color:transparent !important;
}

#deeperMenu
{
left: -999em;
width:132px !important;
}

#deeperMenu .maxidrop-main div ul li a span
{
float:left;
display:block;
width:130px !important;
text-align:center !important;
margin-left:-25px;
}

#deeperMenuShop
{
left: -999em;
width:132px !important;
}

#deeperMenuShop .maxidrop-main div ul li a span
{
float:left;
display:block;
width:130px !important;
text-align:center !important;
margin-left:-25px;
}

#deeperMenuShopCuscini
{
left: -999em;
width:132px !important;	
margin-top:-5px !important;
}

#deeperMenuShopCuscini .maxidrop-main div ul li a span
{
    float:left;
    display:block;
    width:130px !important;
    text-align:center !important;
    margin-left:-25px;
}

#deeperMenuShopAccessori
{
left: -999em;
width:132px !important;	
margin-top:-5px !important;
}

#deeperMenuShopAccessori .maxidrop-main div ul li a span
{
    float:left;
    display:block;
    width:130px !important;
    text-align:center !important;
    margin-left:-25px;
}

/* VERSIONE INGLESE */
#english_bck
{
    float:left;
    width:900px;
    height:245px;
    margin-top:15px;
    background-image:url('../images/english_bck.png');
    background-repeat:no-repeat;
}