[piraids]

все решил проблему так:

jQuery.fn.digitalWatch = function() {
  
  var el = $(this),
  		clock = this,
  		init = function(){
        var date = new Date();
        var hours = date.getHours();
        var minutes = date.getMinutes();
        var seconds = date.getSeconds();
        if (hours < 10) hours = "0" + hours;
        if (minutes < 10) minutes = "0" + minutes;
        if (seconds < 10) seconds = "0" + seconds;
        el.html( hours + ":" + minutes + ":" + seconds );
        
        setTimeout(function(){
          init();
        }, 1000);
      };
  
  
  	init();
    
  
}

$('#clock').digitalWatch();