function centra(){

			var cont=$E('.contGral');
			var pie=$E('#pie');
			var alto=window.getHeight();
			var ancho=window.getWidth();
			var gralAlt=600;
			var gralAnch=750;
			var contAlt=510;
			var posVert=(alto/2-gralAlt/2);
			var posHor=(ancho/2-gralAnch/2);
			posVert<0?posVert=0:posVert=posVert;
			cont.setStyles({
				position:'absolute',
				top:posVert+'px',
				left:posHor+'px'
			})
	
			pie.setStyles({
				position:'absolute',
				top:cont.getTop()+contAlt+45+'px',
				left:cont.getLeft()+10+'px'
			});
		}
		function notaLegal(){
			window.open('nota_legal.html','nota legal', 'width=500,height=350,resizable=yes,scrollbars=yes');
		}