Oppp, one small error. Change this
Code:
window.document.FlashTest.SetVariable("myVar", myValue);
to this
Code:
window.document.FlashTest.SetVariable("var", myValue);
Because we have _root.var not _root.myVar. By the way, variable var wont' work, it is reserved word. I know I know, I was stupid to name it like that. So change it to something else.

Sorry