trying to add an image background

[Phixon]

i am trying to add a repeating background image down the middle of my page. So far I can compressed the template from floating to fixed at 800px by adding a wrapper div that looks like this

div#wrapper {
width: 790px;
margin-right: auto;
margin-left: auto;
background-image: url(images/myimages/background.jpg);
background-repeat: repeat-y;
background-position: center center;
}

As you can see i tried to add the background image in there, bu t it only shows up on the header. Any idea's where I have gone wrong?

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