I played a song by ear, but i am terrible and writing sheet music.

I know the key signature, But i do not know the Time signature of this song, though i am pretty sure it is 4/4.

http://www.youtube.com/watch?v=gDDI3CbXIdM

So, i just need someone to tell me what time signature this is in, and if it is the same time signature through out the entire song. Then i can write the sheets for it. thank you. and sorry if this is in the wrong section.