<div class="divspoiler">
<input type="button" value="Mostrar" onclick="if (this.parentNode.nextSibling.childNodes[0].style.display != '') { this.parentNode.nextSibling.childNodes[0].style.display = ''; this.value = 'Ocultar'; } else { this.parentNode.nextSibling.childNodes[0].style.display = 'none'; this.value = 'Mostrar'; }" />
</div><div><div class="spoiler" style="display: none;">
TEXTO QUE QUIERAS
</div></div>