var ns4 = (document.layers)? true:false;
var ie4 = (document.all)? true:false;
var ns6 = (document.getElementById && !document.all)? true:false;
var mac = (navigator.appVersion.indexOf("Macintosh")>0)? true:false;
function mostrar(capa){	
if (ns4)
{		
    document.layers[capa].visibility = 'show';			
}
else if (ns6)
        {
            document.getElementById(capa).style.visibility = 'visible';
        }
        else
        {
            document.all[capa].style.visibility = 'visible';
        }
}
        
function ocultar(capa){	
if (ns4){					
    document.layers[capa].visibility='hide';    
}else if (ns6){
    document.getElementById(capa).style.visibility = 'hidden';
    }else{
    document.all[capa].style.visibility = 'hidden';
    }
}


//-- Ventana sin botones
function abrirWnd2(url, ancho, alto, nombreVentana)
{
    var w;
    var h;
    if (ancho == null) w = 625;
    else w = ancho;
    if (alto == null) h = 400;
    else h = alto;

    venta=window.open(url, nombreVentana, "top=0,left=0,toolbar=no,directories=no,location=no,status=no,scrollbars=yes,resizable=yes,copyhistory=no,width="+ w +",height="+ h);
}

function escribirCapa(id,Azul9BHTML) {
	if (ns4) 
    {
		Azul9BHTML = '<layer top="0" left="0">'+Azul9BHTML+'</layer>';
		document.layers[id].document.open();
		document.layers[id].document.write(Azul9BHTML);
		document.layers[id].document.close();
	}
    else if (ie4){//document.all[id].innerHTML = Azul9BHTML;
			eval(id).innerHTML = Azul9BHTML;
            
	}else if (ns6) {
		document.getElementById(id).innerHTML = Azul9BHTML;
	}
}