function show_this_section(s)
{

	div = document.getElementById('section' + s);

	if (div.style.display != 'block') {

		div.style.display = 'block'; 	
	} else { 
	
		div.style.display = 'none';
	}	
}




function close_nav() {
		
	for (var i=1; i<=12; i++) {
		div2 = document.getElementById('section' + i);
		if (div2) div2.style.display = 'none';
		else break;	
	}	
}