see student-wave-nm1-index.htm
    var no = 0;
    var xPos = 0;
    var yPos = 0;
  
    function send(number,name) {
       no++;
       // alert(name + " " + no + ":" + xPos + "/" + yPos);
       //var i = Math.floor((Math.random() * 100) % slogan[number].length;
       if (idx[number] >= slogan[number].length) idx[number] = 0;
       var phrase = slogan[number][idx[number]++]; // 'OK';
       $('#' + name).html(phrase).css('border-color',color[number]);
       $('body').css('background',color[number]);
       }
    </script>