#contenitore #colonna_sinistra {
	float: left;
	width: 180px; 
	padding: 0;
	padding-right: 20px; 
}

#contenitore #contenuto_pagina { 
	float: left;
	width: 546px; 
	padding: 0px 14px 15px 15px;
	border-left: 1px dashed #bdbec1; 
}

#contenitore #colonna_destra {
	float: left;
	width: 172px; 
	padding: 10px; 
	background-image:url(../img/sfondo_colonna_destra.jpg);
	background-repeat:repeat-x;
	background-position: 0 0;
	border-right: 10px solid #fff;
}