Hi Can anybody help me to correct this one?

I am getting error message "document.form.Test2" is null or not an object.

I am new to HTML and Scripting.


<html>
<title>JAVASCRIPT</title>

<script language = "JavaScript" type="text/javascript">

function CalculateTotalImpact(){

alert( document.form.Test2.value);

}
</script>

<BODY>

<input id="Test1" type="text" value = "" onchange = "CalculateTotalImpact()" />
<input id="Test2" type="text" value = "" onchange = "CalculateTotalImpact()" />
<INPUT TYPE="button" ONCLICK="CalculateTotalImpact()" VALUE="click to say hello">

</BODY>
</HTML>

Thank you.

Amit