How do I change the body background color with an input button?

I can't figure out why none of these three attempts are changing the background color of my webpage linked below. Does anyone know why?

<input type="button" onClick="document.body.style.background-color='lavender';" value="Change background color" />
<ul>
	<li><img src="lavenderSquare.jpg" onClick="return backgroundLavender()"></img></li>
	<li><a href="#" onClick="javascript:changeBGC('#000099')">Click Blue</a></li>
</ul>

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http://wdiclass.com/poureb/homework4special/homework4special.html
shampouyaAsked:
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micropc1Commented:
It should be "backgroundColor" - not "background-color" for javascript.

So...

document.body.style.backgroundColor='lavender';
srikanthmadishettiCommented:
you can just use this document.bgColor if you want to change the page color see below

<input type="button" onClick="document.bgColor='lavender';" value="Change background color" />
shampouyaAuthor Commented:
I see, and how come this separate function doesn't work?

<script>
function backgroundLavender(){
	document.bgColor="lavender";
}
</script>

<ul>
<li><img src="lavenderSquare.jpg" onClick="backgroundLavender()"></img></li>
</ul>

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srikanthmadishettiCommented:
It should work , it is working for me .
shampouyaAuthor Commented:
So when you click on the lavender square image, the body background turns lavender?
srikanthmadishettiCommented:
Yes , which browser are you using ?
shampouyaAuthor Commented:
Using firefox 8.0. I am able to change the background with the "Change Background Color" button, but not with with the small purple square image. Any idea why the purple square does nothing?
srikanthmadishettiCommented:
You can do it in diff ways
1)

<input type="button" onClick="document.bgColor='lavender';" value="Change background color" />

2)

function changeBackground() {
   document.body.style.background = 'lavender';
}


3)
Write a css func

<style>
body.lavbg
{
  background: lavender;
}
</style>
<input type="button" onClick="document.body.className='lavbg';" value="Change background color" />
shampouyaAuthor Commented:
srikanthmadishettiCommented:
Try this it should work
<style>
body.lavbg
{
  background: lavender;
}
</style>

<ul>
<li><img src="lavenderSquare.jpg" onClick="document.body.className='lavbg';"></img></li>
</ul>

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shampouyaAuthor Commented:
Actually, this worked:

function changeBackground() {
   document.body.style.background = 'lavender';
}
shampouyaAuthor Commented:
You're right
shampouyaAuthor Commented:
thanks
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