Wow... thanks for the help.

Nevermind though, I've managed to make it work. It's beautiful.
I've learned how to make functions in javascript and how to call them from a flash, among other things. I can do all kinds of things with this knowledge.
But when searching more on javascript, I stumbled upon something:
document.getElementById("flashy").style.visibility="hidden";
document.getElementById('flashy').style.display = 'none';
I've used these two at different times, and both seem to have the same effect. My question then is: what are the differences between visibility and display, and which should I use?
...
On a side note, does it matter if I use "" or ''? It doesn't seem to change anything. Are both equal or should I prefer one of them?