That does help, thanks very much. I've now fixed my little problem, but where you stated to use a margin.
I type in

margin-top:15px;

into the #wrapper but still get the background appearing...

The iframe is set to transparent so the background of the DIV "rightcolumn" will be able to be seen, however the background only shows underneath the text, instead of filling the whole thing.
...

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I have a website which uses an iframe to load up the homepage content, this iframe is located within a DIV which I have tried to add a background to, however the background only spans the length of...