var last_expanded = ''; 

function showHide(id) 
{ 
	var obj = document.getElementById(id); 
	var status = obj.className; 
	if (status == 'hideblock') 
	{ 
		if (last_expanded != '') 
		{ 
			var last_obj = document.getElementById(last_expanded); 
			last_obj.className = 'hideblock'; 
		} 
		obj.className = 'showblock'; 
		last_expanded = id; 
	} 
	else 
	{ 
		obj.className = 'hideblock'; 
	} 
}