Ok
Goto into your admin cp:
Goto Replacements ...
Then for you <body> replacement you should have something that looks like this at the moment:
<body bgcolor="#000000" ........
It should be quite large
Right after the <body part put "background="{ imagesfolder}/pagebg.gif"
So it should look something like this:
PHP Code:
<body background="{ imagesfolder}/pagebg.gif ..........
- miSt