var fDesc=new Array();
fDesc[0] = "This small program allows you to take a digital image and digitise a curve or shape on it. You do this by clicking on the image, along the line of the curve of interest. As you do so, the program records the co-ordinates of each point, and marks it with a dot.";

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 = '';
	}
}