What desktop environment are you running?
On MATE you right click on the panel, hit "properties", then change the orientation.
On Cinnamon you go to Cinnamon Settings -> Panel (I think? Something like that) and there's an option for the panel's location.
PC: Manjaro/LM 13 x64 XFCE, Kernel 3.11.1-6/3.8.0-32-generic, Nvidia GTX650, i7 3770K, 16GB RAM, Asus Xonar DX
Laptop: Lenovo G560, LM 13 x64 XFCE, Kernel 3.11.1, i3, 6GB RAMMy HTML5 login themes + screenshots