image_array = new Array(33);
for (i = 0; i < image_array.length; i++)
    image_array[i] = new Image(175, 40);

image_array[0].src = "Images/Buttons/artists_normal.png"
image_array[1].src = "Images/Buttons/artists_active.png"
image_array[2].src = "Images/Buttons/artists_hover.png"
image_array[3].src = "Images/Buttons/comm_normal.png"
image_array[4].src = "Images/Buttons/comm_active.png"
image_array[5].src = "Images/Buttons/comm_hover.png"
image_array[6].src = "Images/Buttons/events_normal.png"
image_array[7].src = "Images/Buttons/events_active.png"
image_array[8].src = "Images/Buttons/events_hover.png"
image_array[9].src = "Images/Buttons/game_normal.png"
image_array[10].src = "Images/Buttons/game_active.png"
image_array[11].src = "Images/Buttons/game_hover.png"
image_array[12].src = "Images/Buttons/guests_normal.png"
image_array[13].src = "Images/Buttons/guests_active.png"
image_array[14].src = "Images/Buttons/guests_hover.png"
image_array[15].src = "Images/Buttons/mobi_normal.png"
image_array[16].src = "Images/Buttons/mobi_active.png"
image_array[17].src = "Images/Buttons/mobi_hover.png"
image_array[18].src = "Images/Buttons/photo_normal.png"
image_array[19].src = "Images/Buttons/photo_active.png"
image_array[20].src = "Images/Buttons/photo_hover.png"
image_array[21].src = "Images/Buttons/reg_normal.png"
image_array[22].src = "Images/Buttons/reg_active.png"
image_array[23].src = "Images/Buttons/reg_hover.png"
image_array[24].src = "Images/Buttons/hotel_normal.png"
image_array[25].src = "Images/Buttons/hotel_active.png"
image_array[26].src = "Images/Buttons/hotel_hover.png"
image_array[27].src = "Images/Buttons/advert_normal.png"
image_array[28].src = "Images/Buttons/advert_active.png"
image_array[29].src = "Images/Buttons/advert_hover.png"
image_array[30].src = "Images/Buttons/merch_normal.png"
image_array[31].src = "Images/Buttons/merch_active.png"
image_array[32].src = "Images/Buttons/merch_hover.png"

function change_image(num) {
    document.images[0].src = image_array[num].src;
}