Checkbox that changes color of entire

Many webbased e-mail system has this page where you can view all your e-mail and there is a check-box to the left that you select when you want to delete certain e-mails. When you click on the checkbox the whole row is highlighted and when you remove the check, it goes back to it's original color. Any ideas how this is accomplished?

give the tr an id, and call a function when the checkbox is clicked, to change the 'className, or 'background-color' property of the TR.
if you want actual code, i'll show you that...