What do i need to do if i want it to be in the center?

CHange this line of code?

stage.addEventListener(Event.RESIZE,onResize);
onResize(null);

Please understand that i'm a total geek on these matters. I bought your program for the simplicity. I managed to build a simple flash website but i don't understand what to do now. I could really use the help.

Someone has ideas?

Thanks in advance!