How do i set up this type of Filter?

　
How do i set up this type of Filter?
http://img.en.china.cn/0/0, 0,471,53011,5 ...

i bought one of these and i was confused, do i just connect the airline to it, then place it in the tank?
answer:
yes connect airline and put it on the bottom of the tank, the air flow will force water to flow through the sponge

here's my shitty sketch of how it'll work
http://i53.tinypic.com/fnssn6.jpg
Yes, you connect the airline to it, and on the other end of the line should be an air pump to power it.