I want to know how to remove the previous text of text box while entering the password ,so tht it should not appear to next user who are going to log in again..
Not sure who is more confused because of that question - me or you :)
I suppose you are about some kind of browser's plugin or add-on, which saves form information.
If so, noone else except you, who are using this browser, will not see what did you enter and save.
Because all other use their own browsers. They can't see what you typed.