.header_left {
    width: 416px;
    height: 26px;
    background-image: url(header_left.jpg);
    background-repeat: no-repeat;
    float: left;
    overflow: hidden;
    white-space: nowrap;
}

.headerConnexion {
    background: url(img/header_800001_petit.jpg) no-repeat right center;
    border-bottom: 0;
}