What is mean this Error !!!

--- In JavaScript_Official@yahoogroups.com,
<listgroups...> wrote:
>
> 
> ----- Original Message ----- 
> From: Zahraa 
> 
> Hi all ,
> I ask about AJAX this file when run show this Error
> line :24
> Error:Type mismatch
> I hope any one have solution tell me .
> Best Regards,
> ------------------------------
> This looks like the problem - 
> http_request.send(username=+theUsername);
> should be - 
> http_request.send("username=" + theUsername);
>
----------------------------------
Thanks for response but still show this Error:Type mismatch
in 
 http_request.open("POST","t.htm");






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