function checkQuiz(){
	
	var intCorrectCount = 0;
	
	for (var i=1;i<=10;i++){
		var displayElName = 'ad'+i;
		var resultElName = 'tr'+i;
		var answerElName = 'ta'+i;
		var optionsElName = 'to'+i;
		var answerValue = document.getElementById(answerElName).value;
		var optionsValue = '';
		
		// check the answer agains the selected option
		var elem = document.getElementsByName(optionsElName);
		for(var j = 0; j < elem.length; j++){
			if (elem[j].checked) optionsValue = elem[j].value;
		}
		
		// reveal the answer and the result
		document.getElementById(displayElName).style.display = 'block';
		
		// add the result and color for right or wrong
		if (answerValue == optionsValue){
			document.getElementById(resultElName).style.backgroundColor = '#0c712d';
			document.getElementById(resultElName).innerHTML = 'CORRECT :)';
			intCorrectCount++;
		}else{
			document.getElementById(resultElName).style.backgroundColor = '#8f0a0a';
			document.getElementById(resultElName).innerHTML = 'WRONG :(';
		}
	}
	
	if (intCorrectCount < 5) strMessage = intCorrectCount+' out of 10.  Looks like you need to hit the books!';
	else if (intCorrectCount < 8) strMessage = intCorrectCount+' out of 10.  Not too shabby!';
	else if (intCorrectCount < 10) strMessage = intCorrectCount+' out of 10.  That\'s pretty good, WAY TO GO!';
	else strMessage = intCorrectCount+' out of 10!!!  GREAT WORK!  You should really be on Jeopardy!';
	
	document.getElementById('quizControl').innerHTML = strMessage;
	
}