How to generate url from use input

Hi,
Is there any way i can generate url according to use input dynamically. Now, i have a route :

  map.search '/search/:word', :controller => 'words', :action => 'search'

  and then i also have a input page which just contain a text input field and button. I want to generate URL like this "/search/:word" when i click the button, and the :word parameter is come from the value of text input field while user input.
  How can do that? Thinks guys