gistfile1.js

disp_time = function(obj) {
  if(obj.length > 0) {
    var time = new Date()
      , tillNextMin = (60 - time.getSeconds()) * 1000
      , waitLoop
      , timeLoop;

    obj.html(current_time());
    waitLoop = setTimeout(function() {
      clearTimeout(waitLoop);
      obj.html(current_time());
      timeLoop = setInterval(function() {
        obj.html(current_time());
      }, 60000);
    }, tillNextMin);
  }
};