How to change the Facebook Connect Button to a Custom Imagem?

I'd like to use a custom imagem to match my theme design for the FB Connect button.
Is it possible to do it using the plugin?
I can create a DIV and insert the image and call a javascript function like the code below.
But is there any available funcions that would call the login for this?

<div id='login'>
<img src="http://clapme.com.br/fb_login_bg.jpg" />
</div>