function validar()
{
        with (document.contactar)
                {
            
               result1 = esta_ple(email);
               result2 = mira_email(email);
			   result3 = esta_ple(comentarios);                                           

               
               if (result1 == 0)
               {
               alerta_en('E-mail adress');
	       	   email.focus();
               }
               else if (result2 == 9)
               {
               alert('The E-mail you entered is not correct.');
	           email.focus();
               }
			   else if (result3 == 0)
               {
               alerta_en('Comments');
			   comentarios.focus();
               }
	       	   else submit();
       }
}