http://www.youtube.com/swf/l.swf?video_id=Jd3-eiid-Uw&rel=1&eurl=http%3A//www.gpgstudy.com/forum/viewtopic.php%3Ftopic%3D18390&iurl=http%3A//img.youtube.com/vi/Jd3-eiid-Uw/default.jpg&t=OEgsToPDskLv_6O7oaFcdn7jXFBMrpIP&
http://www.youtube.com/swf/l.swf?video_id=0awjPUkBXOU&rel=1&eurl=http%3A//www.gpgstudy.com/forum/viewtopic.php%3Ftopic%3D18390&iurl=http%3A//img.youtube.com/vi/0awjPUkBXOU/default.jpg&t=OEgsToPDskI9mE_Kb9yuWabXtuJf7LFQ&
http://www.youtube.com/watch?v=hlLRq_biPOM
재밌는 아이디어들이 많네요
링크 출처 : gpgstudy.com