function ShowHide(ref) 
{ 
	var structure  = document.getElementById(ref); 
	var xstructure = document.getElementById("x" + ref); 
	if (structure.style.display =='none') 
	{ 
		structure.style.display =''; 
	} 
	else 
	{ 
		structure.style.display ='none'; 
	} 
}