I haw maked a form, in this form I want one of the field remember vats typed in that field.

Example if one man vrite somting in the field it vil stand somting in the field next time he visit the site.

You'll prolly end up having to write a function to set a cookie in JavaScript but you can look at a few example on how to do it from a form and set the cookie.

Google search for javascript form cookies (http://www.google.com/search?q=javascript+form+cookies)