resize div overlay

how to resize div overlay, so it detects the size of main window (browser) and determine or set the position of overlay either goes up or down.
johndennyAsked:
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Pravin AsarPrincipal Systems EngineerCommented:
Here is a comprehensive example, which anchors the div to top , bottom and adjusts the middle one accordingly
based on the window size.

The Page listens to  onload and onresize events


<html>
<head>
<title>Set Height of Div on page load and resize-Pravin Asar</title>
<script language="javascript">
function GetWindowSize()
{
    this.width = 0;
    this.height =0;
    var myWidth=800;
    var myHeight=600;
	if( typeof( window.innerWidth ) == 'number' ) {
		//Non-IE
		myWidth = window.innerWidth;
		myHeight = window.innerHeight;
	}
	//IE 6+ in 'standards compliant mode'
	else if( document.documentElement &&
		  (document.documentElement.clientWidth || 
           document.documentElement.clientHeight )) {
		myWidth = document.documentElement.clientWidth;
		myHeight = document.documentElement.clientHeight;
	}
	//IE 4 compatible
	else if( document.body && 
             ( document.body.clientWidth || document.body.clientHeight ) ) {
		myWidth = document.body.clientWidth;
		myHeight = document.body.clientHeight;
	}
 
    this.width = myWidth;
    this.height = myHeight;
    return (this);
}
 
function GetScreenSize () {
	this.width = window.screen.width;
	this.height = window.screen.height;
}
 
function setDivHeight () {
var ws = new GetWindowSize();
var ss = new GetScreenSize();
var hHt = 100;
var fHt = 50;
var dObj;
dObj = document.getElementById ('header');
dObj.style.width = ws.width;
dObj.style.height = hHt;
dObj = document.getElementById ('content');
dObj.style.width = ws.width;
dObj.style.height = ws.height - (hHt) - (fHt);
dObj = document.getElementById ('footer');
dObj.style.width = ws.width;
dObj.style.height = (fHt);
}
</script>
<body onload="setDivHeight();" onresize="setDivHeight();">
<style type="text/css">
* {margin: 0px;
padding: 0px;
}
</style>
<div style="background-color: #FF9933;" id="header">HEADER</div>
<div style="background-color: #33DD99;" id="content">CONTENT</div>
<div style="background-color: #4499dd;" id="footer">FOOTER</div>
</body>
</html>

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