Individual item discription look

Hi there I am using the newest version of zen cart and am trying to layout my shop discriptions like this;
http://www.derbyhouse.co.uk/prodshow.asp?id=146&cat=164&scats=164
With the grey box outlining the information as I think it looks fab.

In IE on my site it looks like this
http://dhfequine.co.uk/shop/index.php?main_page=product_info&cPath=148_153&products_id=432

which is not bad, but in Firefox it looks like this
http://dhfequine.co.uk/shop/index.php?main_page=product_info&cPath=148_153&products_id=432

Can anyone tell me what I am doing wrong as it looks horrid and my site is being viewed by BETA in two weeks and it needs to look perfect.

Kind Regards

Debi DHF Equine :dontgetit

what u need is TABS in the product info page

I think theres an addon in zencart site.

Always design in the most standard compliant browser for you platform...if a PC this is currently FireFox...

Find this in your stylesheet and add what is red

#headerWrapper {
    border-bottom: 1px solid #AE0000;
	margin: 0em;
	padding: 0em;
        height:165px;
	}

Thanks for your input and thanks Kobra for the technical tweak to get my line back lol appreciated. I think Zebra is right Haredo has said the same about the mod but unsure how to find that - any ideas???

Tabbed Products Pro