function changeFormAction() {
  var searchInput = document.getElementById("search_input").value;
  searchInput = searchInput.replace(/(--)|(\/)|(,)|(\\)|(\')|(\")|(:)|(;)|(\?)|(=)|(\+)|(!)|(&)|(>)|(<)|(\*)|(\))|(\()|([)|(])|(\^)|(\%)|(\|)|(#)|(@)|(`)|(~)|(\$)/ig,"");
  var searchForm=document.getElementById("search_form");
  
  searchForm.action= searchForm.action + searchInput + "/1";
  searchForm.submit();

}