function show_db_popup(div) {
	hide_db_popup('db_resins');
	hide_db_popup('db_steel');
	hide_db_popup('db_energy');
	hide_db_popup('db_paper');
	hide_db_popup('db_plastics');
	hide_db_popup('db_calc');
	activeNav = document.getElementById(div);
	if ( activeNav ) {
		activeNav.style.display = 'block';
	}
}

function hide_db_popup(div) {
	activeNav = document.getElementById(div);
	if ( activeNav ) {
		activeNav.style.display = 'none';
	}
}