#cuerpo		{width: 800px; margin-left: -400px; position: absolute; left: 50%; margin-top: -10px; background-color: #bfeae8; }

#cabecera		{width:100%; height:130px; margin-top: 0px; overflow: hidden;	border-color: #d0d0a6; border: 0 none}
#cabecera_frm	{width:100%; height:130px; border-style: hidden;				border-color: #d0d0a6; border: 0 none}

#menu			{width: 20%; margin-top: 0px; float:left;}
#menu_frm		{width:100%; height:   400px; border: 0px;}

#contenido		{width: 80%; margin-top: 0px; float:right;}

#ejemplo {left: 22%;	width: 75%;	height:270px;	margin-top:130px; border: 1; border-style: solid; border-color: yellow; overflow: auto;}