Watched this movie when I was a kid and I can't remember the name of it... Had a boy and his friends messing around with his grandfathers stamp collection and some how he loses them, and he travels around the world and time I think, through mailing a letter (he enters the stamp) to get them back... Help going crazy!

Tommy Tricker and the Stamp Traveller (1988) (http://www.imdb.com/title/tt0096282/)

Thank you so much I think this is it, I'm looking for somewhere to watch it now (or download)