function grade() {
	var errors=0;
	var answered;
	if (qs>0) {
		answered=0;
		for (var i=0; i<document.questions.q1.length; i++) {
			if (document.questions.q1[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("1").className="error";		
		} else document.getElementById("1").className="";
	}

	if (qs>1) {
		answered=0;
		for (var i=0; i<document.questions.q2.length; i++) {
			if (document.questions.q2[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("2").className="error";		
		} else document.getElementById("2").className="";
	}

	if (qs>2) {
		answered=0;
		for (var i=0; i<document.questions.q3.length; i++) {
			if (document.questions.q3[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("3").className="error";		
		} else document.getElementById("3").className="";
	}

	if (qs>3) {
		answered=0;
		for (var i=0; i<document.questions.q4.length; i++) {
			if (document.questions.q4[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("4").className="error";		
		} else document.getElementById("4").className="";
	}

	if (qs>4) {
		answered=0;
		for (var i=0; i<document.questions.q5.length; i++) {
			if (document.questions.q5[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("5").className="error";		
		} else document.getElementById("5").className="";
	}

	if (qs>5) {
		answered=0;
		for (var i=0; i<document.questions.q6.length; i++) {
			if (document.questions.q6[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("6").className="error";		
		} else document.getElementById("6").className="";
	}

	if (qs>6) {
		answered=0;
		for (var i=0; i<document.questions.q7.length; i++) {
			if (document.questions.q7[i].checked) {
				answered = 1;
			}
		}
		if ( answered != 1 ) {
			++errors;
			document.getElementById("7").className="error";		
		} else document.getElementById("7").className="";
	}

	if (errors>0) {
		alert("Please answer all the questions.");
		return false;
	} else {
		return true;
	}
}