[ChristineP]

I do not see a black background in IE6, IE7, Safari or FF. In your styles skin1.cs change
html,body {
background-color: #ffffff;
}

to
html,body {
background-color: #000000;
}

If you have trouble with a style for IE6, then add a IE hack at the bottom of your .css.

* html body {
background-color: #000000;
}