updateprogress position in Firefox (urghh!)

Hi,

I have an updateprogress control that displays nicely in the middle of the screen, but only in IE.

The code is...

<

atlas:UpdateProgressid="loadingProgress"runat="server"><ProgressTemplate>

<divstyle="height:40px;width:250px;position:absolute;z-index:10000;left:expression((this.offsetParent.clientWidth/2)-(this.clientWidth/2)+this.offsetParent.scrollLeft);top:expression((this.offsetParent.clientHeight/2)-(this.clientHeight/2)+this.offsetParent.scrollTop+58); background-repeat: repeat-x; text-align: center; vertical-align: middle; border-right: black 1px solid; border-top: black 1px solid; border-left: black 1px solid; border-bottom: black 1px solid; background-image: url(Images/updateProgressBk.png);">

<

imgstyle="z-index: 109; left: 80px; position: absolute;top:22px"src="images/progressbar_microsoft.gif"/></div></ProgressTemplate></atlas:UpdateProgress> But in Firefox (dont like it myself but some users here use it), it positions on the top left of the screen.

Anyone know a fix, or does Firefox not know about "this.offsetParent.clientHeight" etc?

Thanks

Anyone know how to position the update progress control in the center of the page when viewing from Firefox?