Reporting tool for stats pulled from MySQL db

I have a stats tracking program and a page that displays stats for various dates/items depending on what options the user selects. I need to add some kind of external reporting tool, i.e. they'd like to download the information, preferably in Excel. I tried forcing Excel to open the data instead of the browser by sending headers:

     Header("Content-Type: application/vnd.ms-excel");
     Header("Content-Disposition: attachment; filename='stats.xls'");

When I sent just the first one, all I got was a blank broswer page with a picture (application?) icon in the top left hand corner. Then I added the second header, which I found in a previous post in the archives, and that forced a download but of the page itself (stats_print.php). 1) What am I doing wrong? 2) Every posting I found in the archives said this is the easiest way. Is there another, harder but might work for me, way anyone would suggest of doing this? Thanks in advance, -Lisi