function showunshow_panels( elemId ) {
	//unshow all elements
	document.getElementById('posts').style.display = 'none';
	document.getElementById('categories').style.display = 'none';
	document.getElementById('archives').style.display = 'none';
	document.getElementById('links').style.display = 'none';
	document.getElementById('search').style.display = 'none';
	//show element
	document.getElementById( elemId ).style.display = 'block';
	//set all controls to default
	document.getElementById('c_posts').className = '';
	document.getElementById('c_categories').className = '';
	document.getElementById('c_archives').className = '';
	document.getElementById('c_links').className = '';
	document.getElementById('c_search').className = '';
	//set control to class here
	document.getElementById('c_' + elemId ).className = 'here';
}