function on(imgName) {
	var objStr, obj, imgRurl;
	if(document.images) {
	  		objStr = 'document.' + imgName;
      		obj = eval(objStr);      
      		imgRurl = 'images/' + imgName + '_over.gif';
      		obj.src = imgRurl;
	}
}

function off(imgName) {
	var objStr, obj, imgRurl;
	if(document.images) {
	  		objStr = 'document.' + imgName;
      		obj = eval(objStr);      
      		imgRurl = 'images/' + imgName + '.gif';
      		obj.src = imgRurl;
	}
}

var answers = new Array("c", "a", "b", "c", "b", "a", "a", "c", "b", "b", "a", "c", "c", "a");


function check(ref) {

	var referrer = ref;
	
	var urlParts = referrer.split("/");
	var fileParts = urlParts[7].split("_");
	var scoreParts = fileParts[1].split("?");
	var currentScore = scoreParts[1];
//	if (currentScore == "undefined"){
//	} else {
//		currentScore = 0;
//	}
	if (fileParts[1].indexOf(".", 0) > 0) {
//		alert ("answered correctly");
		currentScore = ++currentScore;
	} else {
//		alert ("answered incorrectly");
		scoreParts = fileParts[2].split("?");
		currentScore = scoreParts[1];
	}
	return currentScore;
}

function pass(loc) {
//	alert ("loc = " + loc);
	var location = loc;
	var scoreParts = location.split("?");	
	var currentScore = scoreParts[1];
//	alert ("currentScore = " + currentScore);
	return currentScore;
}