Click on either of two images if one appears?

So if I fail and lose the game, I want to click on (try again). Also, if I won the game, the same screen would show a different image and I would click "continue". Now, I want to set the script to automatically click on either images if one appears, and continue a different set of instructions accordingly. How would I go about doing that?

If I use an if statement with existsClick, or waitVanishes, I can't predict the amount of time it would take to load before either images appear.