haz esto cambios
Cita: #menu_cont {
top: -12px;
position: relative;
z-index: 1;
border-color: #BEBEBE;
border-bottom-left-radius: 18px;
border-bottom-right-radius: 18px;
border-style: none solid solid solid;
border-width: 0 1px 1px 1px;
background: url(../images/menu_bg.gif) bottom repeat-x;
padding-top: 6px;
height: 47px;
}
header nav {
behavior: url(js/PIE.htc);
padding-left: 10px;
}
.text1 {
font-size: 36px;
color: #545454;
padding: 30px 0 0 47px;
line-height: 48px;
letter-spacing: -2px;
}
pd: tienes muchas reglas repetidas. eliminalas