function toggle(id) {
	var menu = document.getElementById('menu_' + id);
	var img = document.getElementById('img_' + id);
	//var text = document.getElementById(displayText);
	if(menu.style.display == "block") {
    	menu.style.display = "none";
		img.src = '/images/arrowup.gif';
		//update img (arrow)
  	}
	else {
		menu.style.display = "block";
		img.src = '/images/arrowdown.gif';
		//update img (arrow)
	}
}