.menu_principal{
	position:relative;
	float:left;
	width:732px;
	height:471px;
	top:7px;
	padding-left:33px;
	text-align:left;
	/*background-color:yellow;
	filter: alpha(opacity=50);
	opacity: .4;*/
}

a.bt_empresa, a.bt_empresa:visited, a.bt_empresa:active, a.bt_empresa:focus{
	position:relative;
	float:left;
	width:240px;
	height:416px;
	margin-right:4px;

	background:url(bt_empresa.jpg) no-repeat;
}

a.bt_empresa:hover{
	background:url(bt_empresa_over.jpg) no-repeat;
}

a.bt_servicios, a.bt_servicios:visited, a.bt_servicios:active, a.bt_servicios:focus{
	position:relative;
	float:left;
	width:240px;
	height:416px;
	margin-right:5px;

	background:url(bt_servicios.jpg) no-repeat;
}

a.bt_servicios:hover{
	background:url(bt_servicios_over.jpg) no-repeat;
}

a.bt_localizacion, a.bt_localizacion:visited, a.bt_localizacion:active, a.bt_localizacion:focus{
	position:relative;
	float:left;
	width:240px;
	height:416px;
	background:url(bt_localizacion.jpg) no-repeat;
}

a.bt_localizacion:hover{
	background:url(bt_localizacion_over.jpg) no-repeat;
}


.bt_principal{
	position:relative;
	float:left;
	width:728px;
	height:55px;
	text-align:left;
}

a.bt_principal:hover{
	color:#8ACBF5;
}