var fDesc=new Array();
fDesc[0] = "It visualizes gravitational force effects between N objects.<br /> <br /> Gravity Nu has 3 components; Gravity Nu main component (player), Project Editor and Impulse Editor.<br /> <br /> In order to predict/calculate object data (position and velocity) in future or past time (within limits of calculation) one needs object mass, initial position and initial velocity vector at some initial moment of time.";

function tShowHide(id, show)
{
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	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';
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	else
	{
		s.innerHTML = '';
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}