function popUp(obj_id) {
	if (document.getElementById('pop_overlay').style.display == 'block') {
		document.getElementById('pop_overlay').style.display = 'none';
		document.getElementById('pop_container').style.display = 'none';
		document.getElementById('pop_'+obj_id).style.display = 'none';
	} else {
		document.getElementById('pop_overlay').style.display = 'block';
		document.getElementById('pop_container').style.display = 'block';
		document.getElementById('pop_'+obj_id).style.display = 'block';
	}
}