function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}

function changeImagesArray(array) {
    if (document.images && (preloadFlag == true)) {
        for (var i = 0; i < array.length; i += 2) {
            document[array[i]].src = array[i + 1];
        }
    }
}

function changeImages() {
    changeImagesArray(changeImages.arguments);
}

function toggleImages() {
    for (var i = 0; i < toggleImages.arguments.length; i += 2) {
        if (selected == toggleImages.arguments[i]) changeImagesArray(toggleImages.arguments[i + 1]);
    }
}

var selected = '';
var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        menu_item_home_01_over = newImage("images/menu-item-home_01-over.jpg");
      menu_item_about_over = newImage("images/menu-about-school-over.jpg");
        menu_item_Activities_over = newImage("images/menu-item-activities-over.jpg");
        menu_FAQ_over = newImage("images/menu-FAQ-over.jpg");
        menu_contact_over = newImage("images/menu-contact-over.jpg");
        menu_sub_over = newImage("images/sub-menu-over.png");
          menu_school_over = newImage("images/check-out-school-over.png");
          menu_photos_over = newImage("images/photos-of-kids-over.jpg");
         staff_over = newImage("images/staff-over.png");
         parent_over = newImage("images/parent_participation-over.png");
         curr_over = newImage("images/curriculum-over.png");
         tran_over = newImage("images/transportation-over.png");
         wow_over=newImage("images/menu-wow-board.png");
         health_over = newImage("images/health-over.png");
         care_over = newImage("images/aftercare-over.png");
            activities_over = newImage("images/activities-over.png");
            trips_over = newImage("images/trips-over.png");
            night_over = newImage("images/kids-night-out-over.png");
            entertainment_over = newImage("images/entertainment-over.png");
            color_war_over = newImage("images/color_war-over.png");
            music_over = newImage("images/music_and_dance-over.gif");
            arts_over = newImage("images/arts_and_crafts-over.gif");
            cooking_over = newImage("images/cooking-over.gif");
            nature_over = newImage("images/nature-over.gif");
            athletics_over = newImage("images/athletics-over.gif");
            swim_over = newImage("images/swim-over.png");
            playground_over = newImage("images/new-playground-over.png");
            staff_over=newImage("images/Little-Friends-Staff-over.png");
            curriculum_over=newImage("images/curriculum-over.png");
            trips_over=newImage("images/day-camp_trips-over.png");
            facts_over=newImage("images/day-camp_facts-over.png");
            goals_over=newImage("images/day-camp_goals-over.png");
            wow_over=newImage("staff-wow-board-link-over.png");
      preloadFlag = true;
    }
}


<!-- Begin
function curriculum_open() {
    window.open("school-curriculum.htm","","height=500,width=550,left=80,top=60");
}
function staff_open() {
    window.open("school-staff.htm","","height=200,width=550,left=80,top=60");
}
function progress_open() {
    window.open("progress-reports.htm","","height=240,width=550,left=80,top=60");
}
function transportation_open() {
    window.open("transportation.htm","","height=130,width=550,left=80,top=80");
}
function health_open() {
    window.open("health.htm","","height=170,width=550,left=80,top=90");
}
function care_open() {
    window.open("daycare.htm","","height=280,width=550,left=80,top=60");
}