/* Menu script, David L Williams, 03-Oct-11 */
var menu_timeout	= 500;
var menu_close_timer	= 0;
var menu_drop_down_element	= 0;

function menu_display(id){	
	menu_dont_hide();

	// hide previous visible menu
	if(menu_drop_down_element) menu_drop_down_element.style.visibility = 'hidden';

	// show new menu
	menu_drop_down_element = document.getElementById(id);
	menu_drop_down_element.style.visibility = 'visible';
}

function menu_hide(){
	if(menu_drop_down_element) menu_drop_down_element.style.visibility = 'hidden';
}

function menu_hide_after_timeout(){
	menu_close_timer = window.setTimeout(menu_hide, menu_timeout);
}

function menu_dont_hide(){
	if(menu_close_timer){
		window.clearTimeout(menu_close_timer);
		menu_close_timer = null;
	}
}

document.onclick = menu_hide; // close menus when click somewhere