var capa

imagenes = new CreaArray(14)
imagenes[1].src = "bien.gif"
imagenes[2].src = "nada.gif"
imagenes[3].src = "cruz.gif"
imagenes[4].src = "boton.jpg"
imagenes[5].src = "auto.jpg"
imagenes[6].src = "des.jpg"
imagenes[7].src = "pdf.jpg"
imagenes[8].src = "boton_r.jpg"
imagenes[9].src = "auto_r.jpg"
imagenes[10].src = "des_r.jpg"
imagenes[11].src = "pdf_r.jpg"
imagenes[12].src = "pluma1.gif"
imagenes[13].src = "logo1.gif"
imagenes[14].src = "fondo.gif"

function CreaArray(n) {
this.length = n
for (var i = 1; i<=n; i++) {
this[i] = new Image()
}
return this
}
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

function init() {
   if (ns4) {
     capa1 = document.uno
     capa2 = document.dos
     capa3 = document.tres
     capa4 = document.catro
     capa5 = document.cinco
     capa6 = document.seis
     capa7 = document.sete
     capa8 = document.oito
 	 
  }
else if (ie4) {
   capa1 = uno.style
   capa2 = dos.style
   capa3 = tres.style
   capa4 = catro.style
   capa5 = cinco.style
   capa6 = seis.style
   capa7 = sete.style
   capa8 = oito.style
     
 }
 
else
{
capa1=document.getElementById('uno')
capa2=document.getElementById('dos');
capa3=document.getElementById('tres');
capa4=document.getElementById('catro')
capa5=document.getElementById('cinco');
capa6=document.getElementById('seis');
capa7=document.getElementById('sete')
capa8=document.getElementById('oito');
} 

}

function ver(obj) {
 if (ns4) obj.visibility = "show"
 else if (ie4) obj.visibility = "visible"
 else
obj.style.visibility="visible";
 
}

function ocul(obj) {
 if (ns4) obj.visibility = "hide"
 else if (ie4) obj.visibility = "hidden"
  else
   obj.style.visibility="hidden"
}

function open(num)
  {
 if (ns4)
  document.num.visibility = "show"
 else if (ie4) 
   num.style.visibility = "visible"
  else
   document.getElementById("'"+num+"'").style.visibility="visible"
  }

function cerrar(num)
  {
 if (ns4)
  document.num.visibility = "hide"
 else if (ie4) 
   num.style.visibility = "hidden"
  else
   document.getElementById("'"+num+"'").style.visibility="hidden"
  }  

a=1;	
selected = false 
function validar() {
var check= new Array(10);
check[1] = formulario.Uno;
check[2] = formulario.Dos;
check[3] = formulario.tres;
check[4] = formulario.cuatro;
check[5] = formulario.cinco;
check[6] = formulario.seis;
check[7] = formulario.siete;
check[8] = formulario.ocho;
check[9] = formulario.nueve;
check[10] = formulario.diez;

x=0;
while (!selected && (x <check[a].length) && (a<11)) 
{
  if (check[a][x].checked) 
   {
     if(a<10)
       {
	   selected = false;
	   x=0;
	   a++;}
	 else
	   {selected= true;}  

   }
  else
    {
     if(x==3) 
       {
   selected=true;
       }
     else
        x++;
	 
	} 
}
if (!selected) {
alert ("Para seguir debe marcar unha opción na pregunta Nº: "+a);
return false;
}}