如何使用onclick事件单击一个图像并让它在同一网页上更改另一个图像？

The user is supposed to click one of three images, either rock, paper or scissors and when they click on one of these three choices, it changes an image to the right of these 3 images to that of a hand making that shape as you would see in a game of rock, paper, scissors. I can't seem to figure out how to set the onclick event to change the image to the right of the image that is clicked on. Here is a sample of my code.The user is supposed to click one of three imag