Formatting Information in header? Gridlines in Excel

G' morning! Can someone tell me where to find the various options for the Header function as it relates to M$ Excel? Last week, thanks to this list, we found a way to open a worksheet in the browser and display data retrieved from a database. The worksheet opens with no gridlines, I would like to see gridlines. Are there options that can be placed in the header function. I have looked at MSDN and did a Google search that did not reveal much of anything. Here is the header info being used... header("Content-Type: application/x-excel"); header("Content-Disposition: inline; filename=\"excel.xls\""); header("Expires: 0"); header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); Thanks! Jay Blanchard