100分,求做個1-100累加程序.急!!!

<input type="text" name="T1" size="10" value="1"> to <input type="text" name="T1" size="20" value="100"></p>
  <p>結果等于 <input type="text" name="T2" size="20"></p>
  <input type="button" onclick="T2.value=(parseInt(T1[0].value)+parseInt(T1[1].value))" value="計算" name="B1">
<html><head>
<title>test</title>
</head><body><form name="form1" method="POST" action="--WEBBOT-SELF--">
  <p>from <input type="text" name="T1" size="10" value="1"> to <input type="text" name="T2" size="20" value="100"></p>
  <p>結果等于 <input type="text" name="T3" size="20"></p>
  <input type="button" value="計算" name="B1" onclick="getResult()">
</form>
<script>
function getResult(){
var start = parseInt(document.form1.T1.value);
var end = parseInt(document.form1.T2.value);
var result = 0;
for(i=start;i<end;i++){
result += i;
}
document.form1.T3.value = result;
}
</script>
</body></html>
<input type="text" name="T1" size="10" value="1"> to <input type="text" name="T1" size="20" value="100"></p>
  <p>結果等于 <input type="text" name="T2" size="20"></p>
  <input type="button" onclick="a()" value="計算" name="B1">
<script>
function a()
{
n=0
for(i=0;i<document.getElementsByName("T1").length;i++)
{
if(!isNaN(Number(document.getElementsByName("T1")[i].value)))
n+=Number(document.getElementsByName("T1")[i].value)
}
T2.value=n
}
</script>