<!-- 

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("\nPer favore completa la scheda");
            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("\n\nPer favore reinserisci i valori. \nPeso in KG e  \naltezza in 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="putroppo sei obeso!";
       }

       else if (yourbmi >30 && yourbmi <=40) {
          form.my_comment.value="purtroppo sei proprio fuori peso!";
       }

       else if (yourbmi >27 && yourbmi <=30) {
          form.my_comment.value="sei in sovrappeso. ";
       }

       else if (yourbmi >22 && yourbmi <=27) {
          form.my_comment.value="Sei in leggero sovrappeso. ";
       }

       else if (yourbmi >=21 && yourbmi <=22) {
          form.my_comment.value="Sei in forma!";
       }

       else if (yourbmi >=18 && yourbmi <21) {
          form.my_comment.value="Sei un po' magro..";
       }

       else if (yourbmi >=16 && yourbmi <18) {
          form.my_comment.value="Sei molto magro... ";
       }

       else if (yourbmi <16) {
          form.my_comment.value="Troppo magro!";
       }

       }
       return;
}
 // --  -->