i assume your talking about the Airport icon right? just command-click and drag it next to the Time Machine icon.
this is just the 2D dock you get when you put it to the left or right of the screen. to get it at the bottom of the screen copy and paste this command into Terminal which is in the Utilities folder.
Code:
defaults write com.apple.dock no-glass -boolean YES; killall Dock
to get the 3D dock back replace "YES" with "NO"