Randomize images using canvas

[Corona]

Thank you for all your help in setting up the canvas images for the dot 
probe task. I think I was advised to use this option because we will be 
collecting pixel co-ordinate information, as well integrating other 
components into the task (eye tracking for example).

My canvas script allows me to load images side by side (say positive and 
negative). However, I am not sure how to randomize the locations in which 
the images appear (as in - positive images should randomly show up in 
either the left side or right, and similarly for the negative) . At any 
point, the screen has a positive and negative image pair, but the location 
(i.e. whether right or left) in which either of the two appear is unknown. 
My guess was to use the nested property to specify location, but I am not 
sure how to get this attribute (given that it is in a nested list) in the 
inline script for canvas. I am sorry if this sounds convoluted.Any help 
would be appreciated.

Thanks,
Corona

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