HTML to XLS formatting

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I am using php to create a sales report on a XLS document.
I am doing this by writing a HTML string to a file.
Layout is OK but two problems.
1. The columns are much wider than the HTML table in the browser
2. Don't know how to insert a page break
Anybody help me with this?
Thanks

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Hmmm. Problem 1 seems to have solved itself.
Anybody know how to insert page breaks?