function count_vocab(n) {
	var res = 0;
	var codeSpan;
	var objs = document.getElementsByTagName('input');
	
	for(var i = 0; i < objs.length; i++) {
		if(objs[i].checked && (objs[i].value == n)) res ++;
	}
	if(n == 150) {
		document.forms['result_form'].a.value=res*n;
		codeSpan = document.getElementById("sResult");
		codeSpan.innerHTML = res + " x 150 = " + res*n;
	} else if(n == 600) {
		document.forms['result_form2'].b.value=res*n;
		codeSpan = document.getElementById("sResult2");
		codeSpan.innerHTML = res + " x 600 = " + res*n;
	}
	codeSpan = document.getElementById("sTotal");
	var total = eval(document.forms['result_form'].a.value) + eval(document.forms['result_form2'].b.value);
	codeSpan.innerHTML = "(A) + (B) = " + total;
}
function count_self_test() {
	var res = 0;
	var codespan;
	var objs = document.getElementsByTagName('input');
	for(var i = 0; i < objs.length; i++) {
		if(objs[i].checked) res += eval(objs[i].value);
	}
	codeSpan = document.getElementById("points");
	codeSpan.innerHTML = "Your total score is: " + res + " points";
}