Header sem overflow

Em computador com tela muito pequena esta cortando o Header/Menu.

Estou querendo que o Header/Menu use o overflow corretamente.

Alguem poderia me ajudar ?

site: http://www.residencialestreladalva.com.br ( note que se a tela for muito pequena ela “come” o Header/menu)

abaixo tem uma parte do código do HEADER.

/* ################################################################
# HEADER STYLING
################################################################ */

#background_image img {
    /* Set rules to fill background */
    min-height: 100%;
    min-width: 1024px;

    /* Set up proportionate scaling */
    width: 100%;
    height: auto;

    /* Set up positioning */
    position: fixed;
    top: 0;
    left: 0;
	z-index: -999;
}
#header {
	display: none;
	z-index: 400;
	top: 45px;
	left: 45px !important;
	width: 255px;
	position: fixed;
	opacity: 0.8;
}
#header_top {
	height: 6px;
	width: 255px;
	background-image: url(images/bordertop.png);
}
#header_content {
	padding: 14px 0 0;
	background-color: #000;
	-moz-box-shadow: 0 0 3px rgba(0, 0, 0, 0.5);
	-webkit-box-shadow: 0 0 3px rgba(0, 0, 0, 0.5);
	box-shadow: 0 0 3px rgba(0, 0, 0, 0.5);
}
#header_bottom {
	display: block;
	height: 6px;
	width: 255px;
	background-image: url(images/borderbottom.png);
}
#header, #header p {
	color: #868686;
}
#logo {
	width: 235px;
	margin: 0 0 20px 20px;
}
#sitename {
	width: 300px;
	margin: 10px 0 25px 0;
	padding-left: 20px;
}
#sitename a {
	text-transform: uppercase;
	color: #fff;
	font-size: 36px;
}
#search input {
	border: 0px;
	padding: 7px 0 7px 10px;
	color: #666666;
	font-style: italic;
	background: #262626 url(images/search.png) no-repeat right;
	width: 203px;
}
#search {
	opacity: 0.9;
	padding: 22px 0 20px 20px;
}
#search input[type=submit] {
	display: none;
}
#sf-menu ul {
	width: 21.2em;
}
#sf-menu ul li {
	position: relative;
	list-style: none;
	padding: 10px 20px 10px 20px;
	border-bottom: 1px solid #191919;
	background: url(images/plus.png) no-repeat right;
}
#sf-menu ul li {
	display: block;
}
#sf-menu ul li ul {
	position: absolute;
	margin: 20px 0 0 224px;
	width: 18em;
	background-color: #000;
	border-color: transparent;
	z-index: 99999;
}
#sf-menu ul li a {
	text-transform: uppercase;
	border: none;
}
#sf-menu ul li a:active {
	outline: none;
}
#sf-menu ul li a strong {
	font-size: 18px;
	color: #fff;
	display: block;
	z-index: 300;
}
#sf-menu ul li a span {
	clear: left;
	font-size: 14px;
	color: #a0a0a0;
	margin-left: -3px;
}
#sf-menu ul li ul li {
	padding: 0 15px;
	border: none;
	background: none;
}
#sf-menu ul li ul {
	padding: 15px 0;
	border: 1px solid #191919;
}
#sf-menu ul li ul li a {
	color: #fff;
}
#sf-menu ul li ul li a span {
	display: none;
}
#sf-menu ul li ul li ul {
	position: absolute;
	margin: -1px 0 0 195px;
}