Can't enter Chinese URLs

[jidanni@xxxxxxxxxxx]

I type G (G runs the command w3m-goto-url-new-session) and type
URL or Keyword (default HOME): http://www.google.com.tw/search?q=台北客運
but this gets converted to
URL or Keyword (default HOME): http://www.google.com.tw/search?q=%3F%3F%3F%3F%3F%3F%3F%3F
================================================================

System Info to help track down your bug:
---------------------------------------
emacs-w3m-version
 => "1.4.263"
emacs-version
 => "GNU Emacs 22.1.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)\n of 2008-03-03 on raven, modified by Debian"
mule-version
 => "5.0 (SAKAKI)"
system-type
 => gnu/linux
(featurep 'gtk)
 => nil
w3m-version
 => "w3m/0.5.1+cvs-1.968"
w3m-type
 => w3m-m17n
w3m-compile-options
 => ("lang=en" "m17n" "image" "color" "ansi-color" "mouse" "gpm" "menu" "cookie" "ssl" "ssl-verify" "external-uri-loader" "w3mmailer" "nntp" "gopher" "ipv6" "alarm" "mark" "migemo")
w3m-language
 => nil
w3m-command-arguments
 => nil
w3m-command-arguments-alist
 => nil
w3m-command-environment
 => nil
w3m-input-coding-system
 => utf-8
w3m-output-coding-system
 => utf-8
w3m-use-mule-ucs
 => nil