I would like to know how i get easily from Zagreb airport to Zadar? Is there any time-table in internet?

I think you'd have to get the airport bus to central Zagreb first (Autobusni Kolodvor Zagreb) and then get a long distance bus.

Go to:
http://www.akz.hr/voznired/voznired.aspx

There seem to be frequent buses that way, about every half hour or every hour. It will take about 3.5 - 4 hours.
The services are very cheap and many are modern buses with air-con.