On the page:
http://skyvision.com/store/Receivers.html
you have
<body link="#000080" text="black" topmargin="0" leftmargin="0" alink="#000000" bgcolor="#FFFFFF" vlink="#808080">
so the background should be white. If you want it black you should have
bgcolor="#000000"
Note that you also have html problems with the page. There are multiple body tags as shown below in text copied from the page source
<body link="#000080" text="black" topmargin="0" leftmargin="0" alink="#000000" bgcolor="#FFFFFF" vlink="#808080">
<div align="left">
<table border="0" cellpadding="0" cellspacing="0" width="744" bgcolor="#FFFFFF">
<tr>
<td width="100%">
<body topmargin="0" leftmargin="0">
It is hard to say what a browser will do when it encounters bad html so you should make sure that your html is as clean as possible. You can run the page through an html validator to help pinpoint problems. I use this one
http://www.htmlhelp.com/tools/validator/ .