Psychtoolbox: present images not in random order

In each trial a sound file is followed by an image and the image is picked by a random number.

for trial=1:96

%pick a random number of two possibilities

randTextureNum = randi(2);

%use this number to take a picture

ourTexture = textures(randTextureNum);

end

%draw the picture

Screen('DrawTexture',wPtr, ourTexture, [], []);

Now, I like to present the images not randomly, but as they are arranged in the folder.

How can I change the randi(2) ?

Thanks

Susanne