Resize div element according to browser window width

Does anyone know how to do the following.

I have a div element that I want to resize according to the width of the visitors browser.

So if the browser window is say 1024px or less, I would want the div to be 100px less wide than the window size

If the browser is greater than 1024, I want the div to be 1000px max.

It would need to work across all major browsers

Any help on this would be apprciated.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="" >
    <title>Untitled Page</title>
<div id="divMainContent" style="border: 1px solid black; width:BrowserSizeHere;">test</div>

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There you go ;)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="" >
    <title>Untitled Page</title>
function resizeDiv()
   var newWidth=document.body.clientWidth-100;
   if (newWidth>1000) newWidth=1000;
<body onload="resizeDiv()">
<div id="divMainContent" style="border: 1px solid black; width:100px;">test</div>

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BeginningWebDesignAuthor Commented:
Thanks smaccari

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