var fDesc=new Array();
fDesc[0] = "The MiDAS Lens Calculator lets you calculate the parameters of your optics and lenses, pick your focal length, and calculate your working distance, object distance, field of view, depth of focus and more. And, since it knows your camera model, it will help you minimize motion blur and other undesirable video effects. The MiDAS Lens Calculator even helps you learn the impact of extender tubes, diopter lenses and other attachments.";

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 = '';
	}
}