Timing an alert

Hello guys,
I’m a researcher in psychology and I would like to set up a study on cooperation. To control the most parameters as possible, I’d like to present some screenshots after definite delays to make the participant think that it’s the answer from the other participants.

What as been coded so far is that the participant write his real text, then an alert pops up to ask him to wait for the answer. He have to click the alert’s button, then he have to wait for 5 seconds to see another alert saying that the second participant has answered. It’s quite ok but not ideal.

My two questions are :
* can I present a gif (as a timer) instead of the first alert using an “OnClick” command? (i’m sure it’s possible but I still havent found how to atm)
* if so, can I time this gif to dissapear after a while (5 seconds) to make the alert appear ? or if we can’t present a gif with an OnClick command, can I time the first alert to make it dissappear by itself after a while (so they won’t have to click on that one)

Thanks a lot for your comments, ideas or solution.
Kind regards, grib.

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