<script language="JAVASCRIPT">
<!--
function ClearForm(form){
form.weight.value = "";   
form.height.value = "";
form.bmi.value = "";
form.my_healthy.value = "";
}

function bmi(weight, height) {
bmindx=weight/eval(height*height);   
return bmindx;                 
}

function ClearFormbmicheckform(form) {   
if (form.weight.value==null||form.weight.value.length==0 || form.height.value==null||form.height.value.length==0){
alert("\n对不起！输入错误！");
 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这个机器可不是逞能的 \n快改正一下，再测试一遍");
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 >30) {                                 // 进行则评价
form.my_healthy.value="哪有这种身材,身材太胖了!";
}
else if (yourbmi >28 && yourbmi <=30) {      
 form.my_healthy.value="你在不减肥就完蛋了！";
}
else if (yourbmi >25 && yourbmi <=28) { 
form.my_healthy.value="您胖了?必须减肥了";
}
else if (yourbmi >23 && yourbmi <=25) {
form.my_healthy.value="有点偏胖,需要锻炼了";
}
else if (yourbmi >=21 && yourbmi <=23) { 
form.my_healthy.value="你目前是标准身材！";
 }
else if (yourbmi >=18 && yourbmi <21) { 
 form.my_healthy.value="朋友，很明显你的营养不良(^_^)";
 }
 else if (yourbmi >=17 && yourbmi <18) { 
 form.my_healthy.value="这个不是火柴杆吗?(^_^)";
 }
 else if (yourbmi <17) {
 form.my_healthy.value="不能生存的";
  }
  }
return;
  }
//-->
</script>
<form name="bmi" method="POST">
<div align="center">
  <center>
  <table border="1" bordercolor="#888888" cellspacing="1" bgcolor="#cccccc" width="450">
    <tr>
      <td width="65"><div align="center"><center><p>体重(kg)  
          </div>
        </center></td>
      <td align="center" width="64"><div align="center"><center><p>身高(cm)
          </div>
        </center></td>
      <td align="center" width="55"><div align="center"><center><p>健康值
          </div>
        </center></td>
      <td align="center" width="120"><div align="center"><center><p>计算机评价
          </div>
        </center></td>
      <td align="center" width="65"><input TYPE="reset" VALUE="重 填" onClick="ClearForm(this.form)"> </td>
    </tr>
    <tr align="center">
      <td width="65"><input TYPE="TEXT" NAME="weight" SIZE="6" onFocus="this.form.weight.value=''"></td>
      <td width="64"><input TYPE="TEXT" NAME="height" SIZE="6" onFocus="this.form.height.value=''"></td>
      <td width="55"><input TYPE="TEXT" NAME="bmi" SIZE="5"></td>
      <td width="120"><input TYPE="TEXT" NAME="my_healthy" size="20"></td>
      <td width="65"><input TYPE="button" VALUE="显 示" onClick="computeform(this.form)"></td>
    </tr>
  </table>
  </center>
</div>
 <div align="center"><center><p>&nbsp; </p>
 </center></div>
</form>