function mod(div, base)
	{
	return Math.round(div - (Math.floor(div/base)*base));
	}

	function calcBmi()
	{
	var w = document.bmi.weight.value * 1;
	var HeightFeetInt = document.bmi.htf.value * 1;
	var HeightInchesInt = document.bmi.hti.value * 1;
	HeightFeetConvert = HeightFeetInt * 12;
	h = HeightFeetConvert + HeightInchesInt;
	displaybmi = (Math.round((w * 703) / (h * h)));
	var rvalue = true;
	if ( (w <= 35) || (w >= 500) || (h <= 48) || (h >= 120) )
	{
	alert("Invalid data.  Please check and re-enter!");
	rvalue = false;
	}
	if (rvalue)
	{
	if (HeightInchesInt > 11)
		{
		reminderinches = mod(HeightInchesInt,12);
		document.bmi.hti.value = reminderinches;
		document.bmi.htf.value = HeightFeetInt + ((HeightInchesInt - reminderinches)/12);
		document.bmi.answer.value = displaybmi;
		}
	if (displaybmi <19) 
		document.bmi.comment.value = "underweight *";
	if (displaybmi >=19 && displaybmi <=25)
		document.bmi.comment.value = "healthy *";
	if (displaybmi >=26 && displaybmi <=29) 
		document.bmi.comment.value = "overweight *";
	if (displaybmi >=30 && displaybmi <=40) 
		document.bmi.comment.value = "obese *";
	if (displaybmi >40) 
		document.bmi.comment.value = "extremely obese *";
	document.bmi.answer.value = displaybmi;
	}
	return rvalue;
	}