Just use this code in your page:
window.fbAsyncInit = function() {
FB.Canvas.setAutoGrow();
}
// Do things that will sometimes call sizeChangeCallback()
function sizeChangeCallback() {
FB.Canvas.setSize({ width: 500, height: 1400 });
}
and this at the end of the page:
FB.init({
appId : 'YOUR_AP_ID',
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
Of course, you can change the height from 1400px to whatever
