Question : visible white box where there is a margin??? PLEASE HELP!

Can someone please tell me why when I use my background image on this page I am seeing a faint white box at the top?

It has to do something with the margin on the div, when I delete the div, or take the background image away, the faint white area goes away. WEIRD!!!

http://judsondesigns.com/index.cfm

Answer : visible white box where there is a margin??? PLEASE HELP!

I have checked it and the problem relies in

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<title>Untitled Document</title>
<style type="text/css">
<!--
body {
     background-color: black;
     background-image: url(mainBG.jpg);
     background-repeat: no-repeat;
     background-position: center top;
     padding:0px;
      margin:0px;
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I have deleted the html from the bold part above. The same occurs if you remove the "body"