function oc(key, classname, opentext, closetext) {
	
	if (!classname) classname = ''; else classname = '-'+ classname
	o = document.getElementById(key);
	if (o.className == 'openclose-closed') {
		o.className = 'openclose-opened';
		document.getElementById('oc-'+ key).innerHTML = closetext;
	} else {
		o.className = 'openclose-closed';
		document.getElementById('oc-'+ key).innerHTML = opentext;
	}
}