gistfile1.js

function receiveMessage(e) {
    if (e.data.numLoves > 0) {
            OskyPublicLoveButton.getElementsByClassName(button, 'osky-count')[0].innerHTML = e.data.numLoves;
            OskyPublicLoveButton.disableButton(button);
        }
    }
    window.addEventListener('message', receiveMessage, false);
    var login = "https://www.opensky.com/login";
    var loginWindow = window.open(login, "_blank", 'height=500,width=400');