I don't remember where I found this but this seems to do the same thing except it opens in a new window. I don't know which code would be easiest to use but thought it might help.
Code:
javascript:(function(){ID=document.getSelection();if(!ID){location.href='http://outboxnews.com/submit?phase=2%20&url='+location.href+'&title='+encodeURIComponent(document.title)}if(ID){z=open().document;z.location.href='http://inboxnews.com/submit?phase=2%20&url='+location.href+'&title='+encodeURIComponent(document.title)+'&bodytext='+encodeURIComponent(document.getSelection())}})()
Jeremy