function calc (form) {
var S, W, H
S=form.Sex.options[form.Sex.selectedIndex].value
W=form.Weight.value/form.WeightUnit.options[form.WeightUnit.selectedIndex].value
H=form.Height.value*form.HeightUnit.options[form.HeightUnit.selectedIndex].value/100
form.BMI.value = Math.round(W/Math.pow(H,2)*10)/10
if (S == "Male") {
form.Ave.value= 25.9;
}
if (S == "Female") {
form.Ave.value= 24.9;
}
if (form.BMI.value >= 40) {
form.Class.value ="(Obesidad morbida) grado 3"
}
if (form.BMI.value < 40 && form.BMI.value >= 35) {
form.Class.value ="Obesidad grado 2"
}
if (form.BMI.value < 35 && form.BMI.value >= 30) {
form.Class.value ="Obesidad grado 1"
}
if (form.BMI.value < 30 && form.BMI.value >= 25) {
form.Class.value ="Sobrepeso"
}
if (form.BMI.value < 25 && form.BMI.value >= 18.5) {
form.Class.value ="Saludable"
}
if (form.BMI.value < 18.5) {
form.Class.value ="Bajo de peso"
}
}