Create multipacketSD.ino

exemple two 
all the web data are on the SD card
tinyfat library don't support folders so all files are in root 
.hea are headers files 
if you ask an .htm file , arduino will send htm.hea witch contain 
HTTP/1.0 200 OK\r\n
Content-Type: text/html\r\n
Server: Arduino ethercard fred mod\r\n
\r\n
an then the requested file
if you type http://192.168.0.66/test.htm
you will see the test.htm page on the root of your SD card
the sd library use only 8+3 files don't ark .html files you will become not found..
you can store .js files with correct js.hea
change only the mime type (google it to find)
you can specify in header files more options 
Cache (for pictures) so you dont have to reload it every time
the default header is txt.hea
HTTP/1.0 200 OK\r\n
Content-Type: text/plain\r\n
Server: Arduino ethercard fred mod\r\n
\r\n
i have added a server name for exemple but it's not needed