i saw cemical reactions clone effect then i figured out another way (i still use CR's way though)
UPDATE: i just figured out that this is on you tube, but i didnt get this off of youtube i thought of it myself.
Step 1: Get Your Pictures/videos
heres my two (make sure that the object does not cross the middle)
Step 2: The Next Step
open WAX 2.0 (freeware) and goto Project>Add Media files once youve inserted your media drag them onto the time line
Step 3: Last Part
goto "Veiw>Plugin Presets" then click "VL Split Screen" the side. once youve clicked this click "Split Screen Right" dag it onto the top pic/vid then your done