كود معرفة وزنك بالنسبة لجسمك

<script language="Javascript">

function bmiCalc(form) {
        var weight = Number(form.wt.value);
 var height = Number(form.ht.value);
 if (!checkNum(weight,"WEIGHT")) {
  form.wt.select();
  form.wt.focus();
  return false
 }
 if (!checkNum(height,"HEIGHT")) {
  form.ht.select();
  form.ht.focus();
  return false
 }
        if (form.wu.selectedIndex == 0) {
                                        //  What units for weight?
                                        //  0 = lbs
                                        //  1 = kg
                weight = weight * 0.45359237; //  Convert wt (lbs to kg)
        }
        if (form.sex[1].checked) {      //  Is the patient female?
                                        //  0 = male
                                        //  1 = female
  leanConvert = 148;
  idealConvert = 45.5; //  conversion factors for women
        } else {
  leanConvert = 128;
  idealConvert = 50; //  conversion factors for men
 }
 if (form.hu.selectedIndex == 0) { 
    //  if height units are "inches"
  heightInches = height;
  heightMeters = height * 2.54 / 100;
 }
 if (form.hu.selectedIndex == 1) { 
    //  if height units are "cm"
  heightInches = height / 2.54;
  heightMeters = height / 100;
 }
 if (form.hu.selectedIndex == 2) { 
    //  if height units are "meters"
  heightInches = height * 100 / 2.54;
  heightMeters = height;
 }

 var bsa = 0.20247 * Math.pow(heightMeters,0.725) *
  Math.pow(weight,0.425);
 var leanKg = 1.1 * weight - leanConvert * (Math.pow(weight,2) /
  Math.pow((100 * heightMeters),2));
 var leanLbs = leanKg * 2.2046226;
 var idealKg = idealConvert + 2.3 * (heightInches - 60);
 var idealLbs = idealKg * 2.2046226;
 var bmi = weight / Math.pow(heightMeters,2);
 bsa = rounding(bsa,2);
 leanKg = Math.round(leanKg);
 leanLbs = Math.round(leanLbs);
 idealKg = Math.round(idealKg);
 idealLbs = Math.round(idealLbs);
 bmi = rounding(bmi,1);
 if (bmi < 18.5) {
  var interp = " اقل من المعدل الطبيعي"
 } else {
  if (bmi < 25.0) {
  var interp = "مبروك بحدود المعدل الطبيعي"
  } else {
  if (bmi < 30.0) {
    var interp = "اعلى من المعدل الطبيعي"
  } else {
    var interp = "وزنك زائد يجب عليك الحرص في انقاصه"
  }
  }
 }
        form.bsa.value = bsa;
        form.leanKg.value = leanKg;
 form.leanLbs.value = leanLbs;
        form.idealKg.value = idealKg;
 form.idealLbs.value = idealLbs;
        form.bmi.value = bmi;
 form.interp.value = interp;
 return true
}

function checkNum(val,text) {
        if ((val == null) || (isNaN(val)) || (val == "") || (val < 0)) {
  alert("رجاء ادخال ارقام في حقلي الطول و الوزن");
                return false
        }
        return true;
}

function rounding(number,decimal) {
 multiplier = Math.pow(10,decimal);
 number = Math.round(number * multiplier) / multiplier;
        return number
}
// BY [url=http://www.stra28.com/]WWW.STRA28.COM[/url]
</script>
 
<FORM method="post" name="bmi">
<table align="center" cellspacing="1" cellpadding="0" border="0" bgcolor="#000099">
  <tr><td>
    <table cellspacing="3" cellpadding="3" border="0" bgcolor="#F5F5F5" width="300" style="FONT-FAMILY: Tahoma; FONT-SIZE: 12px" dir="rtl">
  <tr><td> <font color="#000080">الجنس :</font> 
    <INPUT checked name="sex" type="radio" value="0">ذكر
<INPUT name="sex" type="radio" value="1">انثى
</td></tr>
<tr><td> <font color="#000080">الوزن :</font>
<INPUT maxLength="4" type="text" name="wt" size="3">
                  <SELECT name="wu" size="1">
              <OPTION value="0">رطل
    <OPTION value="1" selected>كجم
    </SELECT> </td></tr>
    <tr><td>
      <font color="#000080">الطول :</font>
      <INPUT maxLength="3" name="ht" size="3">
    <SELECT name="hu" size="1">
              <OPTION value="0">انش
    <OPTION value="1" selected>سم
    <OPTION value="2">متر
    </SELECT> </td></tr>
              <tr><td>
            <INPUT name="button" onclick="bmiCalc(this.form)" type="button" value="احســـب"> </td></tr>
          <tr><td align="center"> <font color="#ff0000">النتائج :</font> </td></tr>
    <tr><td><font color="#663300">مساحة سطح الجسم :</font>
   
    <INPUT maxLength="5" name="bsa" size="5">
                م<SUP>2</SUP>
              </td></tr>
    <tr><td><font color="#663300">الوزن بدون شحوم :</font>
                <INPUT maxLength="5" name="leanLbs" size="3">
    رطل <b>=</b>
              <INPUT maxLength="5" name="leanKg" size="3">
              كجم</td></tr>
      <tr><td><font color="#663300">الوزن المثالي لك هو :</font>
    <INPUT maxLength="5" name="idealLbs" size="3">
    رطل <b>=</b>
              <INPUT maxLength="5" name="idealKg" size="3">
              كجم</td></tr><tr><td>
 
<font color="#663300">نسبة وزنك لمسطح الجسم :</font>
<INPUT maxLength="5" name="bmi" size="5">
كجم/م<SUP>2</SUP>
</td></tr>
<tr><td align="center">
<INPUT maxLength="12" name="interp" size="40" style="text-align: Center; color: #008000; border-style: solid; border-width: 1; margin-left: 0"></td></tr></table>
          </td></tr></table> </FORM>