Updating Twitter Status

I'm trying to add some twitter funcionality to my website (php). I publish links like

http://twitter.com/home?status=Hello World

When the twitter page loads, the text box appears with the text

  开发者_如何学JAVA     Hello%20World

That is, with the text url-encoded. I suppose that it's related with the encoding of the page (actually, windows-1252) but i can´t figure out wich is the problem.

Thank you in advance

Hello+world