var fDesc=new Array();
fDesc[0] = "This tool simulates a control loop consisting of a first order process with deadtime and a PID controller.<br /> <br /> The process is specified by the process gain, time constant and dead time. The PID controller has 3 parameters: gain, integral and derivative. Key in these values into the appropriate cells. If the integral time is keyed in as 0, the integral term is ignored.<br /> <br /> The response to a step change in the set point is displayed in the chart.";

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 = '';
	}
}