esto hace que sea obligatorio el campo de texto pero que puedan poner cualquier cosa<script language="JavaScript" type="text/JavaScript">
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Esto hace que sea obligatorio poner un correo electrónico
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Esto hace que sea necesario poner numeros en el formulario
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si lo que quieres es hacer que pongan un numero entre 20 y 60 porejemplo mandame un mail a
[email protected]