function validarEmail(valor) {
  if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(valor)){
    return (true)
  } else {
    return (false);
  }
}

function flash(str,w,h,t,v){
  document.write('<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"');
  document.write('codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="' + w + '" height="' + h + '" id="flash">');
  document.write('<param name="movie" value="flash/' + str + '">');
  document.write('<param name="quality" value="high">');
  document.write('<param name="scale" value="noscale">');
  document.write('<param name="menu" value="false">');
  document.write('<param name="FlashVars" value="flashvar=' + v + '">');
  if (t=="true"){document.write('<param name=wmode value="transparent">');} else {document.write('<param name=wmode value="opaque">');}
	
  document.write('<embed src="flash/' + str + '" width="' + w + '" height="' + h + '" FlashVars="flashvar=' + v + '" quality="high" scale="noscale" menu="false" name="flash"');
  if (t=="true"){document.write(' wmode="transparent" ');} else {document.write(' wmode="opaque" ');}
  document.write('type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>');
  document.write('</object>');
  }

function mostrar(str){
  document.ampliacion.src="images/"+str;
  }

function comprueba_boletin(formulario){
    if (formulario.mail.value == ''){
	  alert('El formulario está en blanco');
	  return false;
	} else {
	  formulario.submit();
	}
  }
  
 function comprueba(formulario){
    if (formulario.nombre.value == ''){
	  alert('Debes rellenar el campo Persona de contacto.');
	  return false;
	} else {
	if (formulario.telefono.value == ''){
	  alert('Debes rellenar el campo Teléfono.');
	  return false;
	} else {
	if (formulario.mail.value == ''){
	  alert('Debes rellenar el campo Email.');
	  return false;
	} else {
    var texto = formulario.observaciones.value;
	if (texto.lastIndexOf("<a") > -1){
	  alert('No se permiten enlaces en las observaciones.');
	  return false;
	} else {
	  this.formulario.submit();
	}
	}
	}
	}	  
	
  }