<script language="JAVASCRIPT">

var a = document.getElementById("firstNumber");

var b = document.getElementById("seconfNumber");

function calculate_sum()

{

document.getElementById("result").value = (a+b);

}

function calculate_product()

{

document.getElementById("result").value = (a*b);

}

</script>

<html>

Enter the first no: <input type="text" id = "firstNumber" size="2"/><br/>

Enter the second no: <input type="text" id = "secondNumber" size="2"/>

<input type="button" value="Calculate_Sum" onclick="calculate_sum()"/>

<input type="button" value="Calculate_product" onclick="calculate_product()"/>

Result:<span id="result"/>

</html>

var a = document.getElementById("firstNumber");

var b = document.getElementById("seconfNumber");

function calculate_sum()

{

document.getElementById("result").value = (a+b);

}

function calculate_product()

{

document.getElementById("result").value = (a*b);

}

</script>

<html>

Enter the first no: <input type="text" id = "firstNumber" size="2"/><br/>

Enter the second no: <input type="text" id = "secondNumber" size="2"/>

<input type="button" value="Calculate_Sum" onclick="calculate_sum()"/>

<input type="button" value="Calculate_product" onclick="calculate_product()"/>

Result:<span id="result"/>

</html>