var focused=null;
function show_hide_switch(box_id){
	if(focused==box_id){
		document.getElementById(box_id).style.display='none';
		focused=null;
	}else{
		if(focused!=null){
			document.getElementById(focused).style.display='none';
		}
		document.getElementById(box_id).style.display='block';
		focused=box_id;
	}
}