var fDesc=new Array();
fDesc[0] = "A simple to use interactive activity in which RGB light sources are mixed to create colours. Intended to support basic concepts in science work on light and for experimenting with RGB colour models in ICT.<br /> Updated to include better graphics and slider controls which allow a more complex range of colours to be created";

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 = '';
	}
}