Js Implementation of switching panel instance code _ javascript skills

Switching the Panel has the function: different pictures and explanations are displayed when you move the mouse over different questions. You can connect to different websites. The instance code is as follows, if you are interested, you can refer to the following: Recently, cainiao watched the js video of the wonderful class and learned some knowledge. Here, I will summarize that the Code is a little bloated and I just started to learn it, I don't know how to optimize it. You can give me some advice. Thank you again,
The effect is probably as follows:

Different pictures and comments are displayed when you move the mouse over different questions. You can connect to different websites,
Share my code:

The Code is as follows:

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