HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!-- Beginning of JavaScript -
function changecolor(code) {
document.bgColor=code
}
// - End of JavaScript - -->
</SCRIPT>
</HEAD>
<BODY>
<form>
<input type="button" name="Button1" value="RED" onclick="changecolor('red')">
<input type="button" name="Button2" value="GREEN" onclick="changecolor('green')">
<input type="button" name="Button3" value="BLUE" onclick="changecolor('blue')">
<input type="button" name="Button4" value="WHITE" onclick="changecolor('white')">
</form>
</BODY>
</HTML>
CODE BREAK DOWN
function changecolor(code) {
document.bgColor=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:
document.bgColor=code.
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')"
onClick="changecolor('green')" is telling the program 2 things:
Run the funtion named changecolor(code).
code='green'
Wed Sep 22, 2010 5:57 am
keep sharing more 
