var lastClicked;

function swapImage(imageNum) {
	var wordsImg = document.getElementById("words-img");
	wordsImg.src = "images/words" + imageNum + ".jpg";
	}
	

function hiliteLink(linkId) {
	if (lastClicked) {
		lastClicked.style.fontWeight = "normal";
		}
	
	var thisLink = document.getElementById(linkId);
	thisLink.style.fontWeight = "bold";
	lastClicked = thisLink;
	}