function openMenu(id) {
	var tr = document.getElementById('tr'+id);
	var img = document.getElementById('img'+id);
	if(tr.style.display=='block') {
		tr.style.display='none';
		img.src = 'http://new.cyberctm.com/cn/cs/images/cs_pt_close.gif';
	}else{
		tr.style.display='block';
		img.src = 'http://new.cyberctm.com/cn/cs/images/cs_pt_open.gif';		
	}
}