function initFB(apiKey, path, callback, onLanding) {
    var loadFunc = window.onload;
    var initFunc = function() {
        FB.init(apiKey, path, {"ifUserConnected": callback});
        for (var i = 0; window.FBButtons.size() > i; i ++) {
            var fbId = window.FBButtons.get(i);
            activateFBButton(fbId);
        }
    }

    if(onLanding) {
        initFunc();
    }
    else {
        window.onload = function() {
            if(loadFunc) loadFunc();

            initFunc();                               
        }
    }
}

function activateFBButton(fbId) {
    document.getElementById("Img" + fbId).style.display = "none";
    document.getElementById(fbId).style.display = "";
}