For printing HTML with different margins, I'd recommend taking a look at the CSS printing support (more here). It enables you to write completely different style for printing, and at least the basic parts of it were well supported last time I checked (at least by IE 4+ and recent Mozilla and Konqueror browsers).

Example:

<LINK rel="stylesheet" type"text/css"
     href="print.css" media="print">
[download]