Expat and JavaScript

I'm porting expat to JavaScript (using SpiderMonkey, see my wxJS 
project). The application is in Unicode.
I have the following problem:

When I pass a normal JavaScript string (SpiderMonkey uses UTF-16) to a 
'print' method I don't have to do any conversions to write the data to 
stdout.
When I use a string generated by expat (it is build in UNICODE and 
creates data in UTF-16) I have to do a conversion before I can send the 
string to the 'print' method.
When I look at the expat string in debug mode, I see all weird Chinese 
characters. When I debug the normal JavaScript string, I see normal text.
Is there a conversion needed between SpiderMonkey and Expat?

Maybe this JavaScript code makes some things clearer:

p.parse('<tag1 attr="1" attr2="2"><child1>child</child1></tag1>', true);
if ( p.currentElement.name == "tag1")
{
 wxJS.print("Ok");
}
else
{
 wxJS.print("Not ok");
}
wxJS.print(p.currentElement.name);

The comparison always fails (all though the parsing in expat went fine)

Franky.