diff --git a/system/helpers/download_helper.php b/system/helpers/download_helper.php
index e8bc2f7..2d0e737 100644
--- a/system/helpers/download_helper.php
+++ b/system/helpers/download_helper.php
@@ -37,60 +37,62 @@
  * @param	mixed	the data to be downloaded
  * @return	void
  */	
-function force_download($filename = '', $data = '')
+if (! function_exists('force_download'))
 {
-	if ($filename == '' OR $data == '')
+	function force_download($filename = '', $data = '')
 	{
-		return FALSE;
-	}
+		if ($filename == '' OR $data == '')
+		{
+			return FALSE;
+		}
 
-	// Try to determine if the filename includes a file extension.
-	// We need it in order to set the MIME type
-	if (FALSE === strpos($filename, '.'))
-	{
-		return FALSE;
-	}
+		// Try to determine if the filename includes a file extension.
+		// We need it in order to set the MIME type
+		if (FALSE === strpos($filename, '.'))
+		{
+			return FALSE;
+		}
 	
-	// Grab the file extension
-	$x = explode('.', $filename);
-	$extension = end($x);
+		// Grab the file extension
+		$x = explode('.', $filename);
+		$extension = end($x);
 
-	// Load the mime types
-	@include(APPPATH.'config/mimes'.EXT);
+		// Load the mime types
+		@include(APPPATH.'config/mimes'.EXT);
 	
-	// Set a default mime if we can't find it
-	if ( ! isset($mimes[$extension]))
-	{
-		$mime = 'application/octet-stream';
-	}
-	else
-	{
-		$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
-	}
+		// Set a default mime if we can't find it
+		if ( ! isset($mimes[$extension]))
+		{
+			$mime = 'application/octet-stream';
+		}
+		else
+		{
+			$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
+		}
 	
-	// Generate the server headers
-	if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
-	{
-		header('Content-Type: "'.$mime.'"');
-		header('Content-Disposition: attachment; filename="'.$filename.'"');
-		header('Expires: 0');
-		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
-		header("Content-Transfer-Encoding: binary");
-		header('Pragma: public');
-		header("Content-Length: ".strlen($data));
-	}
-	else
-	{
-		header('Content-Type: "'.$mime.'"');
-		header('Content-Disposition: attachment; filename="'.$filename.'"');
-		header("Content-Transfer-Encoding: binary");
-		header('Expires: 0');
-		header('Pragma: no-cache');
-		header("Content-Length: ".strlen($data));
-	}
+		// Generate the server headers
+		if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
+		{
+			header('Content-Type: "'.$mime.'"');
+			header('Content-Disposition: attachment; filename="'.$filename.'"');
+			header('Expires: 0');
+			header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
+			header("Content-Transfer-Encoding: binary");
+			header('Pragma: public');
+			header("Content-Length: ".strlen($data));
+		}
+		else
+		{
+			header('Content-Type: "'.$mime.'"');
+			header('Content-Disposition: attachment; filename="'.$filename.'"');
+			header("Content-Transfer-Encoding: binary");
+			header('Expires: 0');
+			header('Pragma: no-cache');
+			header("Content-Length: ".strlen($data));
+		}
 	
-	echo $data;
+		echo $data;
+	}
 }
 
-
 ?>
\ No newline at end of file