LK, IIRC a tag for an image TV returns a complete img tag, which wouldn't work so well. Maybe it depends on the output type, though. I'm not sure what comes back if you use 'image' for the input type and 'text' for the output type.
I was thinking of a text TV containing the URL of the image, though that keeps you from using the image browser to select the image. So for Brickthenick the second step would be to just edit each page, and on the TV tab, put the URL of the appropriate image into the TV value.
My other suggestion would be to set the TV value the same way and put something like this in head section of the Template:
<style>
#big_background_image {
background-image: url("[[*TV_name]]");
}
</style>
And something like this in the body section where the image goes:
<div id="big_background_image">
</div>
The tag will be replaced by the value of the TV for that page.
