jQuery - 在按钮单击中淡入和淡出不同的元素

I'm trying to create a few buttons that make a box appear depending on which button is clicked. I'm doing this by giving each box it's own class and passing an argument to a function to identify which box is meant to be targeted. I'm then assigning this function to each button's onclick attribute on the page (I know I should probably attach the event handler in a separate file). Here is the function:I'm trying to create a few buttons that make a