Actually, this is going to be harder than it looks at first glance. You have a couple things working against you here. First, your footer is actually contained in 2 divs, region9wrap and region10wrap. Doing as @gartox suggests will only move part of the footer to the bottom of the page. You would also need to do the same for the other part. To do so you would need this CCS -
.region9wrap {
color: #999;
position: fixed;
left: 0px;
bottom: 30px; /* height of div below*/
width: 100%;
}
.region10wrap {
color: #999;
position: fixed;
left: 0px;
bottom: 0px;
height: 30px;
width: 100%;
}
That will move both parts of the footer down, but now you will have a huge dark stripe where your background does not extend to the footer. Now you have to fix the background. First you need to remove the background from region4wrap completely.
Then add the background to the body tag -
body {
background: url('http://www.smass2.co.uk/images/Cross.jpg') no-repeat #0D0D0D;
}
This will make the background extend all the way down to the footer of the page without causing a big dark stripe.