first create HTML pages that u want for1) error 404 - page not found.2) error 401 - authorization reqd.3) error 403 - access forbidden.make a new subdirectory on the server to hold there arror pages, lets call it "customerror" and lets name the error pages created above as "error404.html" , "error401.html" and "error403.html" {without the quotes}create a new text file and put in the following info:ErrorDocument 401 /customerror/error401.htmlErrorDocument 403 /customerror/error403.htmlErrorDocument 404 /customerror/error404.htmlupload this file onto the server and rename it ".htaccess" {sans the quotes, obviously}, this name is not allowed in windows, so u can only rename it to ".htaccess" {sans the quotes} once the file is up on the server. More info:if u include an image or embed an object in the error pages, u cannot give the relative URL of the object {eg: "../mypic.jpg" or "mypic.jpg"}, u have to give the full path {eg "yourdomain.com/mypic.jpg"}Suggestons:u cud also have the 404 page be redirected to the sitemap of ur site with the suggestion to the user "page not found, select reqd section" or u cud have a feedback form on the 404 error page asking the user for the address of the current page and referring page so that u could point out the place where u placed a wrong hyperlink URL.