Prueba numero 2

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<div class="smallfont"
style="margin-bottom:2px"><b>Jutsusr</b>
para <i>EEE</i>: <input
type="button" value="Mostrar"
style="width:50px;font-size:10px;margin:0px;padding:0px;" onClick="if
(this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display
!= '') {
this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display
= ''; this.innerText = ''; this.value = 'Ocultar'; } else {
this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display
= 'none'; this.innerText = ''; this.value =
'Mostrar'; }">

</div>
<div class="alt2" style="margin: 0px; padding: 6px; border: 1px inset;">
<div style="display: none;">
Spoiler
</div>