homeWhite = new Image(122, 28);
homeWhite.src = 'header/home_white.gif';
homeGray = new Image(122, 28);
homeGray.src = 'header/home_gray.gif';
homeMain = new Image(656, 288);
homeMain.src = 'images/main_home.jpg';

aboutWhite = new Image(100, 28);
aboutWhite.src = 'header/about_white.gif';
aboutGray = new Image(100, 28);
aboutGray.src = 'header/about_gray.gif';
aboutMain = new Image(656, 288);
aboutMain.src = 'images/main_about.gif';

coursesWhite = new Image(87, 28);
coursesWhite.src = 'header/courses_white.gif';
coursesGray = new Image(87, 28);
coursesGray.src = 'header/courses_gray.gif';
coursesMain = new Image(656, 288);
coursesMain.src = 'images/main_courses.gif';

projectsWhite = new Image(86, 28);
projectsWhite.src = 'header/projects_white.gif';
projectsGray = new Image(86, 28);
projectsGray.src = 'header/projects_gray.gif';
projectsMain = new Image(656, 288);
projectsMain.src = 'images/main_projects.gif';

partnersWhite = new Image(86, 28);
partnersWhite.src = 'header/partners_white.gif';
partnersGray = new Image(86, 28);
partnersGray.src = 'header/partners_gray.gif';
partnersMain = new Image(656, 288);
partnersMain.src = 'images/main_partners.gif';

linksWhite = new Image(86, 28);
linksWhite.src = 'header/links_white.gif';
linksGray = new Image(86, 28);
linksGray.src = 'header/links_gray.gif';
linksMain = new Image(656, 288);
linksMain.src = 'images/main_links.gif';

contactWhite = new Image(88, 28);
contactWhite.src = 'header/contact_white.gif';
contactGray = new Image(88, 28);
contactGray.src = 'header/contact_gray.gif';
contactMain = new Image(656, 288);
contactMain.src = 'images/main_contact.gif';


function defaultOn() {

  imgOn = eval(thisPage + "White.src");
  document[thisPage].src = imgOn;
}


function imageOn(imgName) {

  if (imgName == thisPage) {
    document.main.src = eval(imgName + "Main.src");
    return;
  } else {
    imgOn = eval(imgName + "White.src");
    document[imgName].src = imgOn;
    document.main.src = eval(imgName + "Main.src");
  }
}


function imageOff(imgName) {

  if (imgName == thisPage) {
    return;
  } else {
    imgOff = eval(imgName + "Gray.src");
    document[imgName].src = imgOff;
    document.main.src = eval("homeMain.src");
  }
}