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function changecolor(code) {

This page is an excellent example of one function being used by several buttons in the same document. Our function is called changecolor(code). It has only one line:

You probably guessed that bgColor stands for background color.
If I type document.bgColor="red" the background will turn red.

By writing the command document.bgColor=code I am allowing myself to define the variable code as any color I want.

Later, in the form. I define a button with the command:

onClick="changecolor('green')" is telling the program 2 things:

  1. Run the funtion named changecolor(code).
  2. code='green'
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