otherbasic1.js

//  JavaScript: Other Basic Techniques, Example 1
//  Function changes image when it is clicked
//
//  Copyright (c) Paul Griffiths, 2007
//  Email: mail@paulgriffiths.net

var newsrc = "mars.jpg";

function changeImage() {
  if ( newsrc == "mars.jpg" ) {
    document.images["pic"].src = "/images/program/js/forms/mars.jpg";
    document.images["pic"].alt = "Mars";
    newsrc  = "earth.jpg";
  }
  else {
    document.images["pic"].src = "/images/program/js/forms/earth.jpg";
    document.images["pic"].alt = "Earth";
    newsrc  = "mars.jpg";
  }
}