Re:Going down in flames (Score 1)

var hideables = document.getElementsByClassName('hideable');
var controlStamp = document.getElementById('showhidecontrol').cloneNode(true);
controlStamp.removeAttribute('id'); /* Let's not have multiple elements with the same id, mmkay? */
for (var i = 0; i < hideables.length; i++) {
    var hideControl = controlStamp.cloneNode(true);
    hideControl.addEventListener('click', function () { hideables[i].classList.toggle('hidden'); });
    hideables.parentNode.insertBefore(hideControl, hideables[i]);
}
/* With a NodeList.forEach, this code becomes less ugly. */