if (!document.getElementById){
alert("Your browser may not support certain required Javascript features used on this page. If you experience trouble, please send us an email at olcsupport@mcgrawhill.ca, including the name and version of your browser and your computer's operating system (eg WinXP, MacOS X, etc.)");
}

// -----------------------------
function GetSelection(radios) {
for (var i=0; radios.length>i; i++) {
	if (radios[i].checked) {
		return i;
	}
}
return 99;
}
// -------------------------------------
function displayFeedback(form,qNum) {
var para = document.getElementById('q' + qNum + 'feedback');
var pref = '';
var ans = null;
var radio = GetSelection(form['q' + qNum]);
if (radio != 99) {
	ans = form['q' + qNum][radio].value

}

var frontCode = "<font color=\"#999999\"><b>";
var endCode = "</b></font><br />";

if ( !ans ) {
	pref = "You didn't attempt an answer but we'll explain it to you anyway...";
} else if ( ans == answers[qNum] ) {
	pref = "Congratulations, you answered correctly...";
} else {
	pref = "Unfortunately you didn't get it right...";
}

para.innerHTML = frontCode + pref + endCode + feedbacks[qNum];
}