clientWidth issues in IE7!! Noob needs help with small script.

Hello - yes, I am new. I am scared. Help me!

Trying something really basic - got it working fine in other browsers but ie7 is not allowing it.

I have a floating/persistent layer - yes, I know they can be horrible - but it's what I require just this once.

It is meant to sit at the bottom left of the screen, no matter where you scroll.

It works going up & down (clientHeight) but will NOT move away from the left side of the screen when you scroll horizontally.

As I said - works fine in mozilla etc but NOT in ie7.

Please help me - I have tried so many things and no joy.

<!--Here is where Part the XY Script starts-->
<div id="divBottomLeft"  style="position:absolute">

<!--        My layer content          -->




</div>

<!--Below is the floating layer script-->

<script type="text/javascript">
var ns = (navigator.appName.indexOf("Netscape") != -1);
var d = document;
var px = document.layers ? "" : "px";
function JSFX_FloatDiv(id, sx, sy)
{
	var el=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id];
	window[id + "_obj"] = el;
	if(d.layers)el.style=el;
	el.cx = el.sx = sx;el.cy = el.sy = sy;
	el.sP=function(x,y){this.style.left=x+px;this.style.top=y+px; this.style.right=y+px; this.style.bottom=y+px;};
	el.flt=function()
	{
		var pX, pY;
		pX = ns ? pageXOffset : document.documentElement && document.documentElement.scrollLeft ? 
		document.documentElement.scrollLeft : document.body.scrollLeft;
		if(this.sx<0) 
		pX += ns ? clientWidth : document.documentElement && document.documentElement.clientWidth ? 
		document.documentElement.clientWidth : document.body.clientWidth;
		
		pY = ns ? pageYOffset : document.documentElement && document.documentElement.scrollTop ? 
		document.documentElement.scrollTop : document.body.scrollTop;
		if(this.sy<0) 
		pY += ns ? innerHeight : document.documentElement && document.documentElement.clientHeight ? 
		document.documentElement.clientHeight : document.body.clientHeight;
		this.cx += (pX + this.sx - this.cx)/8;
		this.cy += (pY + this.sy - this.cy)/8;
		this.sP(this.cx, this.cy);
		setTimeout(this.id + "_obj.flt()", 40);
	}
	return el;
}

JSFX_FloatDiv("divBottomLeft",    5, -40).flt();


</script>

Code (markup):