var fDesc=new Array();
fDesc[0] = "Airborne Navigation is an application that helps you learn how to navigate with VOR, NDB, GPS, HSI, RMI, and Airspace in an interactive, multimedia environment. It does so by walking you through important topics, such as how navigation is performed, how to find position, how to track a course, and how to transition from one airspace region to another.";

function tShowHide(id, show)
{
	var s = document.getElementById("desc");

	if ((s.innerHTML.length<=212 || show==1) && show!=2)
	{
		s.innerHTML = fDesc[id];
		if (document.getElementById('m1'))
			document.getElementById('m1').style.display='none';
		if (document.getElementById('m2'))
			document.getElementById('m2').style.display='none';
		if (document.getElementById('more_txt'))
			document.getElementById('more_txt').style.display='inline';
	}
	else
	{
		s.innerHTML = '';
	}
}