I no the problem is not with the program its with my pc. I am able to compile this program fine on my school's pc but i can't on my laptop.

The program is
public class SwingIO
{
public static void main(String[] args)
{
/*
(To contrast this sample with the ConsoleIO program, note
that no "throws IOException" clause is required above in
the declaration of the method: main. Note also that the
swing input routines do not require declarations analagous
to those of InputStreamReader and BufferedReader objects
of the ConsoleIO program.)
*/

/*
Following are the input variables of this sample program.
Note that numbers must be read in as Strings and then
converted.
*/
String name;
String numberString; // Each number will be read here in turn

/*
Numeric inputs will be converted to ints and placed in
these two variables.
*/
int number1, number2;

/*
Following produces an input window to pop us with the prompt
message shown in the parameter. Whatever the user enters is
stored in the name variable.
*/
name = JOptionPane.showInputDialog("What is your first name?");

/*
Read and convert the first integer. Note: the program will
crash in the conversion process if a value entered for either
the first or second integer are not valid integer numbers.
*/
numberString = JOptionPane.showInputDialog(
"Enter first integer value:");
number1 = Integer.parseInt(numberString);

/*
Read and convert the second integer (see note just above).
*/
numberString = JOptionPane.showInputDialog(
"Enter second integer value:");
number2 = Integer.parseInt(numberString);

// Calculates and displays the answer
JOptionPane.showMessageDialog(null, "Hello, " + name + "!" + "\n" +
"The sum of " + number1 + " and " + number2 +
" is " + (number1 + number2) + ".");
}
}

And the error message is

C:\Documents and Settings\Admin\My Documents\Java Programs\SwingIO.java:34: cannot resolve symbol
symbol : variable JOptionPane
location: class SwingIO
name = JOptionPane.showInputDialog("What is your first name?");
^
C:\Documents and Settings\Admin\My Documents\Java Programs\SwingIO.java:41: cannot resolve symbol
symbol : variable JOptionPane
location: class SwingIO
numberString = JOptionPane.showInputDialog(
^
C:\Documents and Settings\Admin\My Documents\Java Programs\SwingIO.java:48: cannot resolve symbol
symbol : variable JOptionPane
location: class SwingIO
numberString = JOptionPane.showInputDialog(
^
C:\Documents and Settings\Admin\My Documents\Java Programs\SwingIO.java:53: cannot resolve symbol
symbol : variable JOptionPane
location: class SwingIO
JOptionPane.showMessageDialog(null, "Hello, " + name + "!" + "\n" +
^
4 errors

Tool completed with exit code 1

Also i should have mentioned that i am useing the same compiler on my laptop that i us at school "Textpad". My school has Java 2 SDK ,SE v1.4.2_12 installed. I have that and J2SE Runtime Enviroment 5.0 update 6.

Any advise?

There is nothing wrong with your program nor your compiler. It is only that you forgot to include this statement:

import javax.swing.JOptionPane;

That is why the compiler doesn't recognise JOptionPane function.