function  calculateBMI() {
  var weight = eval(document.form.weight.value)
  var height = eval(document.form.height.value)
  var height2 = height / 100
  var BMI = weight  / (height2 * height2)
  document.form.BodyMassIndex.value=custRound(BMI,1);

if (custRound(BMI,1) <19) 
document.form.category.value = "Underweight";
if (custRound(BMI,1) >=19 && custRound(BMI,1) <=25) 
document.form.category.value = "Ideal BMI";
if (custRound(BMI,1) >=26 && custRound(BMI,1) <=29) 
document.form.category.value = "Overweight";
if (custRound(BMI,1) >=30 && custRound(BMI,1) <=34) 
document.form.category.value = "Obese";
if (custRound(BMI,1) >=35 && custRound(BMI,1) <=39) 
document.form.category.value = "Severely Obese";
if (custRound(BMI,1) >=40 && custRound(BMI,1) <=49) 
document.form.category.value = "Morbidly Obese";
if (custRound(BMI,1) >50) 
document.form.category.value = "Super Obese";

}

function custRound(x,places) {
  return (Math.round(x*Math.pow(10,places)))/Math.pow(10,places)
}