function showMenu(id) {
	if (document.getElementById('tr_'+id)) {
		trMenu = document.getElementById('tr_'+id);
		if (trMenu.style.display == '') {
			trMenu.style.display = 'none';
		}
		else {
			hideAllSubMenu();
			trMenu.style.display = '';	
		}	
	}
}
function hideAllSubMenu() {
	tbl = document.getElementById('menuTable');
	divs = tbl.getElementsByTagName('DIV');
	//alert(divs.length);
	for ( i=0; i<divs.length; i++) {
		if(divs[i].id && divs[i].id.substr(0, 3) =='tr_') {
			divs[i].style.display = 'none';
		}		
	}
	
}