I am using bassistance.de jQuery Autocomplete function.

Have text like "hello to you @john" I made, Autocomplete run only when character @ is in word. But when I click on the needed item, it replaces me full text. How can I do so - to replace only "@john"? Or maybe there is another Autocomplete plugin for jQuery, which has such ability?

$('#input_line').autocomplete('data.php', {

extraParams: {input: function(){return GetTextareaWord("input_line");}} });