This first picture is the road heading to the Thai immigration offices.
Anything to Declare? then this is the office you want, NongKhai customs.
One of the 3 Thai immigration offices is in the back right hand side of this picture, after stamping out of Thailand You hang around here waiting for the 20baht bus to take you across the bridge to Laos, children below 12 go for free.
The bus is obviously not aircon, still what do you expect for 20baht...
More Visa Runs and Border Crossing Points can be found here (Thailands Border crossing points)