var fDesc=new Array();
fDesc[0] = "Field of View Calculator is a program for calculating the camera’s visible scene. When choosing the model name, the sensor size and focal length will automatically be displayed automatically be displayed. To calculate camera's visible scene, enter any 2 out of 4 items and click [Calculate] then rest 2 will be automatically calculated.";

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 = '';
	}
}