Mine

<script>
function toggle() {
	id = 'stuff';
	if (document.getElementById(id).style.display == 'none') {
		document.getElementById(id).style.display = 'block';
	} else {
		document.getElementById(id).style.display = 'none';
	}

}
</script>

<a href="javascript:toggle();">click me</a>


<div id="stuff" style="display: none;">
this is hidden stuff
</div>