Dot Probe

[dkille]

I am programming a dot probe task and I am unsure of how to randomize the location of the dot. Basically, within a trial I have two words on the left and right side of the screen (matched for length and freq. – so these words will always be paired together). A picture of a dot replaces one of the words, and the participant is to indicate the location of the dot. I want the dot to randomly replace either the left or right word as opposed to having the dot replace the same word for each participant. How do I go about randomizing dot location (left or right) within a given trial?
Any comments are welcome!