.txt_null {
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 8px;
	float:left;
	font-weight: normal;
}

#mtop_home {
  background: url("../imagenes/home.png") 0 0 no-repeat;
}

#mtop_home a {
padding-top: 0px; width: 20px; height: 18px; 
float:left;
background: url("../imagenes/home.png") 0 0 no-repeat;
}

#mtop_home a:hover {
background-position: -20px 0;
}

#mtop_mapa {
  background: url("../imagenes/mapa.png") 0 0 no-repeat;
}

#mtop_mapa a {
padding-top: 0px; width: 20px; height: 18px; 
float:left;
background: url("../imagenes/mapa.png") 0 0 no-repeat;
}

#mtop_mapa a:hover {
background-position: -20px 0;
}

#mtop_buscar {
  background: url("../imagenes/buscar.png") 0 0 no-repeat;
}

#mtop_buscar a {
padding-top: 0px; width: 20px; height: 18px; 
float:left;
background: url("../imagenes/buscar.png") 0 0 no-repeat;
}

#mtop_buscar a:hover {
background-position: -20px 0;
}

#search {
	float:left;
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 10px;
	text-align: left;
	border: 1px solid #BBBDBF;	
	margin-top: 1px;
	margin-bottom: 1px;

}

#box_search {
	border: 1px solid red;	
	vertical-align: bottom;
}