var menudown = false;
var menuheight = 280;

function startslidedown(){
		document.getElementById("menu").style.height = "1px";
		document.getElementById("menu").style.display = "block";
		document.getElementById("menu").style.visibility = "visible";
		starttime_down = (new Date()).getTime();
		slidetimer_down = setInterval('slidedown();',5);
}

function slidedown(){
	var elapsed = (new Date()).getTime() - starttime_down;
	if (elapsed > 500)
		endslidedown()
	else {
		var d = Math.round(elapsed / 500 * menuheight);
	    document.getElementById("menu").style.height = d + "px";
	}
	return;
}

function endslidedown(){
	menudown = true;
	clearInterval(slidetimer_down);
	document.getElementById("menu").style.height = menuheight+"px";
	return;
}

function startslideup(){
	if (menudown == true) {
		document.getElementById("menu").style.height = menuheight+"px";
		document.getElementById("menu").style.display = "block";
		starttime_up = (new Date()).getTime();
		slidetimer_up = setInterval('slideup();',5);
	}
}

function slideup(){
	var elapsed = (new Date()).getTime() - starttime_up;
	if (elapsed > 500)
		endslideup()
	else {
		var d = Math.round(elapsed / 500 * menuheight);
		d = menuheight - d;
	    document.getElementById("menu").style.height = d + "px";
	}
	return;
}

function endslideup(){
	menudown = false;
	clearInterval(slidetimer_up);
	document.getElementById("menu").style.height = "0px";
	document.getElementById("menu").style.display = "none";
	document.getElementById("menu").style.visibility = "hidden";
	hide_menus()
	return;
}

var timerstate = false;

function stop_timer () {
	if (timerstate) {
		clearTimeout(goawaytimer);
		timerstate = false;
	}
}

function start_timer () {
	stop_timer();
	timerstate = true;
	goawaytimer = setTimeout('startslideup()',1000);
}

function hide_menus() {
	document.getElementById("menu_athletics").style.display = "none";
	document.getElementById("menu_athletics").style.visibility = "hidden";
	document.getElementById("menu_about").style.display = "none";
	document.getElementById("menu_about").style.visibility = "hidden";
	document.getElementById("menu_future").style.display = "none";
	document.getElementById("menu_future").style.visibility = "hidden";
	document.getElementById("menu_current").style.display = "none";
	document.getElementById("menu_current").style.visibility = "hidden";
	document.getElementById("menu_alumni").style.display = "none";
	document.getElementById("menu_alumni").style.visibility = "hidden";
	
	document.button_athletics.src="/interface2/button_athletics_off.jpg";
	document.button_about.src="/interface2/button_about_off.jpg";
	document.button_future.src="/interface2/button_future_off.jpg";
	document.button_current.src="/interface2/button_current_off.jpg";
	document.button_alumni.src="/interface2/button_alumni_off.jpg";
}

function show_menu(which) {
	hide_menus();
	document.getElementById("menu_"+which).style.display = "block";
	document.getElementById("menu_"+which).style.visibility = "visible";
	document["button_"+which].src="/interface2/button_"+which+"_on.jpg";
}