Hey, I have the exact same problem. I've built a custom menu that slides out from the side of the browser and it works good and all. Problem is it is not scaling with the height of the document when placed in Adobe Muse... I am struggling to get this to work, I read that you have to call the Parent window within the document the Hype document, in which it is contained. It will then recognise the browsers dimensions and allow the animation to respond to the browsers height. I haven't figured it out yet and would also like some help / advice on this.