Button Help

Hi!

I need help with my button in my Unity project. I want it to work so that when you click and hold the button, it changes textures from an unclicked texture to a clicked texture and stays there, BUT when you release the left mouse button, the button changes back to an unclicked texture. Here's an unnecessarily huge .gif depicting that: Thanks, and please reply with a code snippet I can use, and include things I need to change in it. Bye!