function clock(){
  
  var heartbeat = setInterval(beat, 1000);
	
	function beat(){
 	 	var year, month, date, hours, minutes, seconds, milliseconds, time, now;
	 
		 now = new Date();
	 
		 day = now.getDay();
	 	 date = now.getDate();
		 month = now.getMonth();
		 hours = now.getHours();
	     minutes = now.getMinutes();
   		 seconds = now.getSeconds();
	     milliseconds = now.getMilliseconds();
	     ampm = '';
     		
     	if(hours > 12) {
			hours = hours - 12;
			ampm = "pm";
		}

		else {
		ampm = "am";
		}	
     		
    	hours   = ((hours <  10) ? "0" : "") + hours;
	  	minutes = ((minutes <  10) ? "0" : "") + minutes;
    	seconds = ((seconds <  10) ? "0" : "") + seconds;

		
	    $('em').removeClass('now');
    	$('#d'+date).addClass('now');
	    $('#day'+day).addClass('now');
    	$('#month'+month).addClass('now');
    	$('#'+ampm).addClass('now');

	    $('#h'+hours).addClass('now');
   	  	$('#m'+minutes).addClass('now');
     	$('#s'+seconds).addClass('now');
	    $('#x'+seconds).addClass('now');

 	}
}