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#-- wrapper function to create a worksheet with particular formatting
writeXlsx <- function(d, fn, sheet_name = ''){
	require(openxlsx)
	# creates xlsx workbook containing data
	# header styling
	hs1 <- createStyle(fgFill = "#4F81BD", halign = "LEFT", textDecoration = "Bold", border = "Bottom", fontColour = "white")
	cs1 <- createStyle(wrapText = TRUE, halign = 'LEFT', valign = 'top')
	wb <- createWorkbook() 
	addWorksheet(wb, sheetName=sheet_name)
	setColWidths(wb, 1, 1:ncol(d), 'auto')
	freezePane(wb, 1, firstRow = TRUE)
	writeData(wb, 1, d, headerStyle = hs1)
	addStyle(wb, 1, style = cs1, rows = 2:(nrow(d) + 1), cols = 1:ncol(d), gridExpand = TRUE)
	saveWorkbook(wb, fn, overwrite = TRUE)
}