/* http://greentooth.xtgem.com 

Body Mass calculator- by John Scott (johnscott03@yahoo.com)

Visit JavaScript Kit (http://javascriptkit.com) for script
 */

 

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("\nPlease complete the form first");
            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("\nReally know what you're doing? \nPlease enter values again. \nWeight in kilos and \nheight 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="Grossly Obese";
       }

       else if (yourbmi >30 && yourbmi <=40) {
          form.my_comment.value="Obese";
       }

       else if (yourbmi >27 && yourbmi <=30) {
          form.my_comment.value="Hefty";
       }

       else if (yourbmi >22 && yourbmi <=27) {
          form.my_comment.value="Overweight";
       }

       else if (yourbmi >=21 && yourbmi <=22) {
          form.my_comment.value="Normal Weight";
       }

       else if (yourbmi >=18 && yourbmi <21) {
          form.my_comment.value="Underweight";
       }

       else if (yourbmi >=16 && yourbmi <18) {
          form.my_comment.value="Undernourished";
       }

       else if (yourbmi <16) {
          form.my_comment.value="Malnourished ";
       }

       }
       return;
}