Script won't work on my website....

Ok I want to add a script to my website and I have but for some reason it won't work. The place where I got the script said I just had to put it in and works automatically.

\\<div id="gw_wallpaperoftheday_">
<a href="javascript:gwGetPreview_();">
<img src="http://www.gamewallpapers.com/wallpaperoftheday/wallpaperoftheday_.jpg" width="120" height="90" border="0" onError="document.all.gw_wallpaperoftheday_.style.visibility='hidden';">
</a><br>
</div>
<script>
function gwGetPreview_() {
url = "http://www.gamewallpapers.com/wallpaperoftheday/getpreview.php?type=";
ipwindow = window.open(url,"_blank","fullscreen=no,resizable=no,scrollbars=no,toolbar=no,height=316,width=400");
}
</script>\\

That is the script and this is the place i want to add it to. www.immortalfx.com

I've tried everything but I dont' know why it doesn't appear.


Oh and another thing. The \\ aren't part of the script I just added those to show the beginning and end of the scrip.