#contenido{
    background-image:url(snow.gif);
 	border:solid 1px #999999;
	margin:10px auto;
	padding:10px;
	width:380px;
	height:300px;
	overflow:auto;
	float:left;
}

#menu{
	border:solid 1px #999999;
	background:#9999CC;
	margin:10px;
	padding:5px;
	width:100px;
	float:left;
}

#preloader{
	border:solid 1px #999999;
	margin:10px;
	width:220px;
	height:14px;
	padding:0;
	float:left;
	visibility: hidden;
}