sth wrong about Chinese

[~.??????]

In the searchbox.jsp there is a searchboxmenu and  in the searchboxmenu there 
is al lot of onclicks. the users can use the js to enter the name of the page 
they want to edit or view. However if the input is Chinese it does not work 
well. I think sth is wrong with the urlencoding.Maybe using UTF-8 can solve the 
problem but I don't know how to modify the jspwiki-common.js to realize. Anyone 
can help? Thanks~