controlling printing in generated HTML page

Hi guys,
I m developing a project in JSP.
there are some reports wich are generated from database in HTML.
some reports are very long, to print I m selecting print from File menu.
but printing reports in such way is not giving good impression
i want that when data in group changes page break is inserted, but I dont know how to do that.
help me to control printing of HTML page.
give me some source code if possible
thanx in advance..
Bansal

Read this:
http://www.javascriptkit.com/dhtmltutors/pagebreak.shtml