I have read two good threads regarding this both at site point and webmasterworld.
The links are
xhttp://www.sitepoint.com/forums/showthread.php?t=440863
xhttp://www.webmasterworld.com/forum88/12322.htm
Kind Regards,
Nicolas Johnson
Toll Free 1-800-549-7407
MSN nicolas_1875 at hotmail dot com