function show(c) 
	{ 
		if (document.getElementById && document.getElementById(c)!= null) 
			node = document.getElementById(c).style.display=''; 
		else if (document.layers && document.layers[c]!= null) 
			document.layers[c].display = ''; 
		else if (document.all) 
			document.all[c].style.display = ''; 
	}//show

	function hide(c) 
	{ 
		if (document.getElementById && document.getElementById(c)!= null) 
			node = document.getElementById(c).style.display='none'; 
		else if (document.layers && document.layers[c]!= null) 
			document.layers[c].display = 'none'; 
		else if (document.all) 
			document.all[c].style.display = 'none'; 
	}//hide

	function toggle_visibility(id) {
		var e = document.getElementById(id);
		if(e.style.display == 'block')
			e.style.display = 'none';
		else
			e.style.display = 'block';
	}