can any body tell me,How do I creat user sign up & Sign in, in my personal web site & How do creat connection between web page sign up or sign in form & my mail server...& what things r required for that......
You will probably need PHP for both things. Try these links: http://www.google.com/search?hl=en&q=create+a+login+page+using+php&aq=1&oq=create+a+login+page+ I think this is what you mean for the second question: http://www.google.com/search?hl=en&q=contact+form+in+php&btnG=Google+Search&aq=f&oq=
You must use some programming language. With pure HTML/CSS you can't do it. I think that PHP is the best for that. Just google it, you can find something already made.
Use Google to search for "cgi resources index" or "php resources index" to find the scripts for "signup" or "membership" functionality for your site. You will need to install the appropriate script on your server. - Vaddi