function init_howto()
{
	var howto = document.getElementById("howto_toggle");
	var start_opened = (howto.className == "toggle_off");
	howto.onclick = toggle;
	if (!start_opened)
	{
		howto.className = "toggle_on";
		var desc = document.getElementById("howto_desc");
		desc.style.display = 'none';
	}
}

function toggle()
{
	var desc = document.getElementById(this.id.slice(0, -7)+"_desc");
	desc.style.display = (desc.style.display == 'none') ? 'block' : 'none';
	this.className = (desc.style.display == 'none') ? 'toggle_on' : 'toggle_off';
	return false;
}

addOnLoad(init_howto);