function Validar(Form)  {
    return (
         ValidarEmail(Form.Email.value)
      );
   }

/* Función para validar la dirección de e-mail */

  function ValidarEmail(email){
    var cadena = "Your email is not valid: " + email
      + "\nPlease enter your correct email address." + "\nThank you for writing to Argentinian Explorer." ;
 
    if( email.indexOf('@',0) <= 0  || email.indexOf(';',0) != -1
     || email.indexOf(' ',0) != -1 || email.indexOf('/',0) != -1
     || email.indexOf(';',0) != -1 || email.indexOf('<',0) != -1
     || email.indexOf('>',0) != -1 || email.indexOf('*',0) != -1
     || email.indexOf('|',0) != -1 || email.indexOf('`',0) != -1
     || email.indexOf('&',0) != -1 || email.indexOf('$',0) != -1
     || email.indexOf('!',0) != -1 || email.indexOf('"',0) != -1
     || email.indexOf(':',0) != -1 )
       { alert(cadena); return false; }
    else return true;
    }