<SCRIPT>

// define variables for the rest of the script
var question = "What is 10 + 10?"; // create the question
var answer = 20;
var correct = '<IMG SRC="correct.gif">'; // "correct" gif for the answer is correct
var incorrec = '<IMG SRC="incorrec.gif">'; // "incorrec" gif for the answer is wrong

// ask the question
var response = prompt(question, "0");

// "return" the "correct" gif if the person gets the answer right else
// "return" the "incorrec" gif if the person gets the answer wrong
// output is a global variable that is available to the entire page
var output = (response == answer) ? correct : incorrec;

</SCRIPT>

<BODY>

<SCRIPT>

// output the results - either the correct.gif or incorrec.gif
document.write(output);

</SCRIPT>

Remember - everything gets evaluated from top to bottom. Steps:

  1. Create the variables
  2. Ask the question
  3. Evaluate the result
  4. Assign the result to output
  5. Write out the output