function ValidaEmail(campo) {
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(campo.value)){
return (true)
}
if (campo.value.length == 0)
{
	return (true)
}
alert("Endereço de e-mail inválido.")
campo.focus();
return (false)
}
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