var fDesc=new Array();
fDesc[0] = "Fotoview Graphing is an easy to use program for drawing and exploring graphs of mathematical functions and their derivatives. Functions can be entered by typing on the keyboard or by pressing the function buttons on the screen with the mouse. You can zoom in and out and move the graph around in a flexible way. You can also open, save and print the graphs and functions.";

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 = '';
	}
}