function hideImage() {
	//var numlinks = 7;
	var linkTag;
	var content;
	var question
	for (i=0; i <= numlinks; i++) {
		linkTag = "link" + i + "a";
		content = "content" + i;
		question = "question" + i;
		document.getElementById(content).style.display = "none";
		document.getElementById(linkTag).className = "";
		document.getElementById(question).className = "";
		}
	}
function showImage(which) {
	hideImage();
	var linkTag2 = "link" + which + "a";
	var content2 = "content" + which;
	var question2 = "question" + which;
	document.getElementById(content2).style.display = "block";
	document.getElementById(linkTag2).className = "active";
	document.getElementById(question2).className = "active";
	document.getElementById("filler").innerHTML = "";
	for (i=0; i < which; i++) 
		document.getElementById("filler").innerHTML += "<p>&nbsp;</p>";
}