time or frame based actions.

Hy community!

INFO: I am a video editor and not a fulltime coder.
For the production of html5 banners, which only have the whole stage as link and no other interaction I have a question about timing.

I am building the whole banner on layers which contain the different elements on a single layer.

All elements are movie clips, so i can work with them in the code.
Everything is pretty self-explaining when i work with the timeline and set keyframes for animation and make motion tweens but this is a lot of work when i set up different sizes of banners. I now try to just set it up as it should look at the end of the animation and programm every animation in code. most of it works fine. I mostly use alpha or position animations.
I think this is the best way to deal with easy animation banners - or do you still set up everything with tweens in the timeline?

My question: (maybe it´s a stupid one or really easy to explain for a programmer)
Can I code everything in the first frame and say there "at frame 50" or "after 2 seconds" do this: ...
So i don´t need to make keyframes at the exact frame times and change it there.
It will be a lot easier later on to just change the time of the lenght or start of an animation for 1 sujet for every banner-size.

so at frame 1 i have an action:

var logo1_FadeInCbk = fl_FadeSymbolIn.bind(this);

this.addEventListener('tick', logo1_FadeInCbk);

this.logo1.alpha = 0;

function fl_FadeSymbolIn()

{

this.logo1.alpha += 0.05;

if(this.logo1.alpha >= 1)

{

this.removeEventListener('tick', logo1_FadeInCbk);

}

}

and at frame 180 i have another to fade it back.

Is it possible to code fade in and fade out at the same frame, using frame numbers or a timecode?

This would help a lot.

This would also help me with stopping the "rotate continuously" after a time period. Right now I have no sollution for this one also.

thank you!