otherbasic5.js

//  JavaScript: Other Basic Techniques, Example 5
//  Function changes image when it is clicked and a confirm message is accepted
//
//  Copyright (c) Paul Griffiths, 2007
//  Email: mail@paulgriffiths.net

var newsrc = "mars.jpg";

function changeImage() {
  if ( newsrc == "mars.jpg" && confirm("Are you sure you want to change the image to Mars?") ) {
    document.images["pic"].src = "/images/program/js/forms/mars.jpg";
    document.images["pic"].alt = "Mars";
    newsrc  = "earth.jpg";
  }
  else if ( newsrc == "earth.jpg" && confirm("Are you sure you want to change the image to Earth?") ) {
    document.images["pic"].src = "/images/program/js/forms/earth.jpg";
    document.images["pic"].alt = "Earth";
    newsrc  = "mars.jpg";
  }
}