Excel 2007 : Change default settings of "Save external links values" and "Update links to other..

Every time I move one sheet to a new book, the check boxes of "Save external links values" and "Update links to other documents" in the new book are checked. How can I make the default of a new book for these values to be unchecked. The size of the files differs very much, 72 kb when not checked and 1.2 mb when checked.