var server = 'http://' + window.location.hostname + ':' + window.location.port;

 function request_words() {   

     $.ajax({url: server + '/words',

 	    dataType: 'json',

 	    success: callback});

 }

 function select(better, worse) {

     $.ajax({url: server + '/rate',

             dataType: 'json',

             data: 'bn=' + better[0] + '&br=' + better[1]

             + '&wn=' + worse[0] + '&wr=' + worse[1],

             success: callback});

 }

 function select_left() {

     select(new Array($.cookie('left-word'), $.cookie('left-rank')), 

            new Array($.cookie('right-word'), $.cookie('right-rank')));

 }

 function select_right() {

     select(new Array($.cookie('right-word'), $.cookie('right-rank')), 

            new Array($.cookie('left-word'), $.cookie('left-rank')));

 }

 function callback(data, status, xhr) {    

     $('#compare-left').text(data.words[0][0]);    

     $('#compare-right').text(data.words[1][0]); 

     if (data.words[2] && data.words[3]) {

         $('#result-left').text(data.words[2][0]);

         $('#result-left-rating').text(data.words[2][1]);

         $('#result-right').text(data.words[3][0]);     

         $('#result-right-rating').text(data.words[3][1]);

     }

     $.cookie('left-word', data.words[0][0]);

     $.cookie('left-rank', data.words[0][1]);

     $.cookie('right-word', data.words[1][0]);

     $.cookie('right-rank', data.words[1][1]);

 }

 $(document).ready (

     function() {

         request_words();

     }

 );

 $(document).keypress (

     function(event) {

 	if (event.which == 13) {

 	    event.preventDefault();

 	}

     }

 );