diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index d276fe9..fdf30bf 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -522,15 +522,24 @@ function booking_varietysessions_csv_report($timeslot_id) {
   header('Content-Transfer-Encoding: binary');
   header('Cache-Control: must-revalidate');
   header('Pragma: public');
-  $rows = array(
-      array('2003','1','-50.5','2010-01-01 23:00:00','2012-12-31 23:00:00'),
-      array('2003','=B1', '23.5','2010-01-01 00:00:00','2012-12-31 00:00:00'),
+  $data1 = array(  
+    array('5','3'),
+    array('1','6'),
   );
+  $data2 = array(  
+      array('2','7','9'),
+      array('4','8','0'),
+  );
+
   $writer = new XLSXWriter();
-  $writer->setAuthor('Some Author'); 
-  foreach($rows as $row)
-    $writer->writeSheetRow('Sheet1', $row);
-  $writer->writeToStdOut();
+  $writer->setAuthor('Doc Author');
+  $writer->writeSheet($data1);
+  $writer->writeSheet($data2);
+  echo $writer->writeToString();
+
+  //foreach($rows as $row)
+  //  $writer->writeSheetRow('Sheet1', $row);
+  //$writer->writeToStdOut();
   //$writer->writeToFile('example.xlsx');
   //echo $writer->writeToString();
   exit(0);  
diff --git a/libraries/xlsxwriter.class.php b/libraries/xlsxwriter.class.php
index 056f04b..31a0978 100644
--- a/libraries/xlsxwriter.class.php
+++ b/libraries/xlsxwriter.class.php
@@ -85,6 +85,24 @@ Class XLSXWriter
 		return $string;
 	}
 
+	public function sanitize_filename($filename) //http://msdn.microsoft.com/en-us/library/aa365247%28VS.85%29.aspx
+	{
+		$nonprinting = array_map('chr', range(0,31));
+		$invalid_chars = array('<', '>', '?', '"', ':', '|', '\\', '/', '*', '&');
+		$all_invalids = array_merge($nonprinting,$invalid_chars);
+		return str_replace($all_invalids, "", $filename);
+	}
+	//------------------------------------------------------------------
+	public function sanitize_sheetname($sheetname) 
+	{
+		static $badchars  = '\\/?*:[]';
+		static $goodchars = '        ';
+		$sheetname = strtr($sheetname, $badchars, $goodchars);
+		$sheetname = substr($sheetname, 0, 31);
+		$sheetname = trim(trim(trim($sheetname),"'"));//trim before and after trimming single quotes
+		return !empty($sheetname) ? $sheetname : 'Sheet'.((rand()%900)+100);
+	}	
+
 	public function writeToFile($filename)
 	{
 		@unlink($filename);//if the zip already exists, overwrite it