algo mas simple? mmmm te sirve este ejemplo?
Código HTML:
Ver original<span onclick="mostrar('hola')">hola mundo
</span> <div id="hola" class="ocultar">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.
</div> <script type="text/javascript"> function mostrar(id){
var NuevaCapa = document.getElementById(id);
if(NuevaCapa.className == 'ocultar'){
NuevaCapa.className = '';
}
else{
NuevaCapa.className = 'ocultar';
}
}