function show_div(div_id)
	{ 
		document.getElementById(div_id).style.display = 'block'; 
	} 
	 
	function hide_div(div_id) 
	{ 
		document.getElementById(div_id).style.display = 'none'; 
	} 
	
	function swap_div(div_id1, div_id2) {
		document.getElementById(div_id1).style.display = 'block';
		document.getElementById(div_id2).style.display = 'none';
	}