How to go Koh Si Chang from Bangkok?

逞強久了自己都覺得累
hey any expert of backpackers, do you know how should i get to koh si chang from bangkok using the cheapest transportation?

and by the way, does anyone know that whether the jetty of Koh si Chang near to BAI LONG WANG or not?

thank you
一言不合就拔刀
http://www.modernthailand.com/pattaya/koh-si-chang.htm