var fDesc=new Array();
fDesc[0] = "CCTV Design Lens Calculator can calculate the angle of view and field-of-view size based on the distance and the focal length of the lens. It helps you choose the most suitable lenses, heights, and locations for camera installation as per the required parameters of view areas.";

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 = '';
	}
}