function showdiv() {
	if (document.getElementById("certificate").style.display == 'block') {
	document.getElementById("certificate").style.display='none';
	document.getElementById("certificateLink").innerHTML='Click here to see an example of the certificate awarded at the end of this course.';
	} else {
	document.getElementById("certificate").style.display='block';
	document.getElementById("certificateLink").innerHTML='Click here to hide the image.';
	}
}

function courseExtra() {
	if (document.getElementById("courseExtra").style.position == 'relative') {
		document.getElementById("courseExtra").style.position = 'absolute';
		document.getElementById("courseExtra").style.zIndex = '-10';
		document.getElementById("courseExtraLink").innerHTML = 'show more';
	} else {
		document.getElementById("courseExtra").style.position = 'relative';
		document.getElementById("courseExtra").style.zIndex = '10';
		document.getElementById("courseExtraLink").innerHTML = 'show less';
	}
}