adding two values and dispaly into third textbox

hello techies,
lets see how to add two values from two different textboxes and display in third textbox...write the following code and check yourself

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<script type="text/javascript" language="javascript ">
function adding()
{
var a = document.getElementById("text1").value;
var b = document.getElementById("text2").value;

var c = parseInt(a)+ parseInt(b);
document.getElementById("text3").value = c;
//document.write("parseInt(a)+b = "+c);
}
</script>

first number &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
    <input id="text1" onchange="adding()" />
    <br />
    <br />
Second Number &nbsp; &nbsp; &nbsp; &nbsp;
    <input id="text2" onchange="adding()" />
    <br />
    <br />
result &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;
    &nbsp;
    <input id="text3" />

</asp:Content>

thanks
ankit saxena