function hotButton (imgObj, imgName, imgDesc) {
    this.active = new Image();
    this.active.src = 'btn/' + imgName + '-hi.gif';
    this.inactive = new Image();
    this.inactive.src = 'btn/' + imgName + '-lo.gif';
    this.desc = imgDesc;
    this.image = imgObj;
}

btns = new Array();

function initButton (imgObj, imgName, imgDesc) {
    btns[imgName] = new hotButton(imgObj, imgName, imgDesc);
}

function activateButton (imgName) {
    btns[imgName].image.src = btns[imgName].active.src;
    window.status = btns[imgName].desc;
}

function deactivateButton (imgName) {
    btns[imgName].image.src = btns[imgName].inactive.src;
    window.status = "";
}