#bloques_izq {
	float:left;
  	width:225px;
	margin-top:0px;
  	margin-left:10px;
  	margin-right:0px;
  	margin-bottom:0px;
}

#cuerpo {
	padding-top:0px;
	margin-top:0;
  	margin-left:240px;
  	margin-right:10px;
  	margin-bottom:2px;
  	text-align:center;

}

#bloques_der {
	width:0;
	height:0;
	display:none;
}