function BMI(form) {
 measw = form.measw.options[form.measw.selectedIndex].value;
 meash = form.meash.options[form.meash.selectedIndex].value;
 TotalInches = form.height.value * meash;
 Meters      = TotalInches/39.36;
 Kilos       = form.weight.value/2.2 * measw;
 Square      = Meters * Meters;
 form.calcval.value = (Math.round(Kilos/Square));
}