function ClearForm(form){
    form.weight.value = "";
    form.height.value = "";
    form.bmi.value = "";
    form.my_comment.value = "";
}
function bmi(weight, height) {
          bmindx=weight/eval(height*height);
          return bmindx;
}
function checkform(form) {
       if (form.weight.value==null||form.weight.value.length==0 || form.height.value==null||form.height.value.length==0){
            alert("\nVeuillez remplir le formulaire");
            return false;
       }
       else if (parseFloat(form.height.value) <= 0||
                parseFloat(form.height.value) >=500||
                parseFloat(form.weight.value) <= 0||
                parseFloat(form.weight.value) >=500){
                alert("Entrez votre poids en kilos \nEntrez votre taille en cm");
                ClearForm(form);
                return false;
       }
       return true;
}
function computeform(form) {
       if (checkform(form)) {
       yourbmi=Math.round(bmi(form.weight.value, form.height.value/100));
       form.bmi.value=yourbmi;
         if (yourbmi >=40) {
          form.my_comment.value="Obésité grade III : Obésité massive";
       }
       else if (yourbmi >=35 && yourbmi <40) {
          form.my_comment.value="Obésité grade II : Obésité sévère";
       }
    
    else if (yourbmi >=30 && yourbmi <35) {
          form.my_comment.value="Obésité grade I : Obésité modérée ou commune";
       }
       else if (yourbmi >=25 && yourbmi <30) {
          form.my_comment.value="Surpoids";
       }
       else if (yourbmi >=18.5 && yourbmi <25) {
          form.my_comment.value="Normal";
       }
       else if (yourbmi >=17 && yourbmi <18.5) {
          form.my_comment.value="Dénutrition grade I";
       }
       else if (yourbmi >=16 && yourbmi <17) {
          form.my_comment.value="Dénutrition grade II";
       }
       else if (yourbmi >=13 && yourbmi <16) {
          form.my_comment.value="Dénutrition grade III";
       }
       else if (yourbmi >=10 && yourbmi <13) {
          form.my_comment.value="Dénutrition grade IV";
       }
       else if (yourbmi <10) {
          form.my_comment.value="Dénutrition grade V";
       }
       }
       return;
}