Javascript- can someone write this code for me?

Contain a drop down using the select tag with the following:
a. Title: Red Value: #FF0000
b. Title: Green Value: #00FF00
c. Title: Blue Value: #0000FF
d. Title: Black Value: #000000
The drop down menu should have the name "colors" and should have the event onChange call a method named changeColor(this.form) to pass the form value to the function.

Create the function changeColor. The function should identify the selected index, get the corresponding hexadecimal value, and change the background color of the web page to the given color. To change the color of the web page, assign the following object a hexadecimal color value: document.body.bgcolor.

This is an assignment for an HTML class I am taking, and these are the instructions from the professor - however, I cannot figure out how to do this.
Any help is greatly appreciated.
Thanks.

document.body.bgcolor is an outmoded usage - should be document.body.style.backgroundColor. Also, providing "White" as the first value (default) ensures that a change event will be fired for the selection of any other color; if "Red" was the first value, and the user picked it on initial entry to the page, no change event would fire.

<head>

<script>
function changeColor(form) {
var select = form.elements[0];
var choice = select.selectedIndex;
var color = select[choice].value;
var s = document.body.style;
s.backgroundColor = color;
}
</script>

</head>
<body>
<form>
<select
onchange="changeColor(this.form);">
<option value="#FFFFFF"
>White (default)</option>
<option value="#FF0000"
>Red</option>
<option value="#00FF00"
>Green</option>
<option value="#0000FF"
>Blue</option>
<option value="#000000"
>Black</option>
</select>
</form>
</body>
</html>

<html>

actually i have visual basic but i think ican help you i use this in it ""

when you press a:
document.body.bgcolor = a.title

when you press b:
document.body.bgcolor = b.title

when you press c:
document.body.bgcolor = c.title

when you press d:
document.body.bgcolor = d.title

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