function showhide(evt) {
	var show = document.getElementById('preview-youtube').getElementsByTagName('span')[0];
	if (show.style['display'] != 'block') show.style['display'] = 'block';
	else show.style['display'] = 'none';
}


function expandPreview() {
	var prev = document.getElementById('preview-youtube');
	if (prev.addEventListener) prev.addEventListener('click',showhide,false);
	else prev.onclick = showhide;
}

addsetup('expandPreview()');