// JavaScript Document
function showLink1() {
    document.getElementById('topLink_img').src = "images/btn_visitMocean_hover.png";
}

function showLink2() {
    document.getElementById('topLink_img').src = "images/btn_visitMocean.png";
}

function showMainLink1() {
    document.getElementById('mainLink_img').src = "images/btn_hover.png";
}

function showMainLink2() {
    document.getElementById('mainLink_img').src = "images/btn_brown.png";
}