function grow() {
    var callout = document.getElementById("callout_overlay");
    var bwidth = document.body.offsetWidth * 0.8;
    
    if (callout.offsetWidth == 36) {
        var open = new sb_transition(callout, 'width', bwidth);
        open.engage(600, function() {
            var img = document.getElementById('label');
            img.src = '/images/exquisite_corps_close.png';});     
     } else {
        var close = new sb_transition(callout, 'width', '36');
        close.engage(400, function() {
            var img = document.getElementById('label');
            img.src = '/images/exquisite_corps.png'; });
    }
}