function alerta(div, h, w, b){
	if (h==null) h=130;
	if (b==null) b={'Aceptar':function(){ $(this).dialog('close'); }};
	$(div).show();
	$(div).dialog({ modal:true, 
						height:h, 
						width:w,
						overlay:{opacity:0.5, background:"black"},
						buttons: b
					});
}


function alertaSinBotones(div, h, w){
	if (h==null) h=130;
	$(div).show();
	$(div).dialog({ modal:true, 
						height:h,
						width: w,
						overlay:{opacity:0.5, background:"black"}
				  });
}