function show(id) { 

if (document.getElementById) { 
	obj = document.getElementById(id); 

		obj.style.visibility = "visible"; 
} 
}
function hide(id) { 

if (document.getElementById) { 
	obj = document.getElementById(id); 

		obj.style.visibility = "hidden"; 
} 
}

function showhide(id) { 

if (document.getElementById) { 
	obj = document.getElementById(id); 
	
	if (obj.style.visibility == "visible")
		obj.style.visibility = "hidden"; 
	else obj.style.visibility = "visible"; 
} 
}