Help with mouse click to skip intro

I have an issue with an intro I’m doing.
I have made animation which is around 200 frames and in the main timeline, so that it starts when you load the page.
I want the user to be able to click anywhere on the screen to skip this intro as it takes a while to load on slow connections.
At the moment I have made a large button on a layer under the animation which only works as a button when you have loaded the page into the cache and not the first time you load it. I need some help to make it work first time you load it as well.
What could be the issue here?
Alternatively, I would really appreciate if there is some kind of click anywhere on the screen function that I could use.
Any ideas?
Thanks!