var fDesc=new Array();
fDesc[0] = "Learn About Physical Science: Simple Machines is a program in which students delve into the mechanical world, learning the ways simple machines make our work easier. Animated demonstrations of the lever, pulley, wheel, screw, wedge, and inclined plane bring physical science concepts to life.";

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 = '';
	}
}