function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}
function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		about_us_button_over = newImage("images/about-us-button-over.gif");
		directors_button_over = newImage("images/directors-button-over.gif");
		memberships_button_over = newImage("images/memberships-button-over.gif");
		agencies_button_over = newImage("images/agencies-button-over.gif");
		conference_button_over = newImage("images/conference-button-over.gif");
		top_gun_button_over = newImage("images/top-gun-button-over.gif");
		training_button_over = newImage("images/training-button-over.gif");
		sponsorship_over = newImage("images/sponsorship-over.gif");
		legal_button_over = newImage("images/legal-button-over.gif");
		links_button_over = newImage("images/links-button-over.gif");
		announcements_button_over = newImage("images/announcements-button-over.gif");
		home_button_over = newImage("images/home-button-over.gif");
		preloadFlag = true;
	}
}