//written by RhysMac
function dtEven(form) {
price=form.price.value;
if((price==null)||(price=="")||(isNaN(price)))
	{ form.answer.value="?";
		alert('Please enter price with numbers only.');
		form.price.focus();
		form.price.select();
		return false;
		}

pt1=form.pt1.value;
if((pt1==null)||(pt1=="")||(isNaN(pt1)))
	{ form.answer.value="?";
		alert('Please enter scores with numbers only.');
		form.pt1.focus();
		form.pt1.select();
		return false;
		}

pt2=form.pt2.value;
if((pt2==null)||(pt2=="")||(isNaN(pt2)))
	{ form.answer.value="?";
		alert('Please enter scores with numbers only.');
		form.pt2.focus();
		form.pt2.select();
		return false;
		}

var answer=price / 3986.4 * 3 -pt1 - pt2;
var round=Math.round(answer);
form.answer.value=round;
}