<SCRIPT>

function testQuestion(question) {
     var answer = eval(question); // evaluates the string & returns 10
     var output = "What is " + question + "?";  //creates the question string

     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

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

     // return the "correct" gif if the person gets the answer right else
     // return the "incorrec" gif if the person gets the answer wrong
     return (response == answer) ? correct : incorrec;

}

</SCRIPT>

<BODY>

<SCRIPT>

// call the function testQuestion() and pass the string argument "10 + 10"
// and return the "result" back to variable result
var result = testQuestion("10 + 10");
          |__________
                               |
document.write(result); // output the results - either the correct.gif or incorrec.gif

</SCRIPT>

Steps:

  1. function testQuestion() is in memory for use
  2. call testQuestion() and pass the string argument "10 + 10" & return the "result" back to the variable result
  3. Write out the "result" to the page