devi inserire una nuova variabile...

usa questo

codice:
<SCRIPT LANGUAGE="JavaScript"> 

var timerID = null; 

var timerRunning = false; 

function stopclock (){ 

if(timerRunning) 

clearTimeout(timerID); 

timerRunning = false; 

} 

function showtime () { 
//Variabile da settare
var testo="Sono le ore ";
var now = new Date(); 

var hours = now.getHours(); 

var minutes = now.getMinutes(); 

var seconds = now.getSeconds() 

var timeValue = "" + ((hours >12) ? hours -12 :hours) 

timeValue += ((minutes < 10) ? ":0" : ":") + minutes 

timeValue += ((seconds < 10) ? ":0" : ":") + seconds 

timeValue += (hours >= 12) ? " p.m." : " a.m." 

document.clock.face.value = testo+timeValue; 

// you could replace the above with this 

// and have a clock on the status bar: 

// window.status = timeValue; 

timerID = setTimeout("showtime()",1000); 

timerRunning = true; 

} 

function startclock () { 

// Make sure the clock is stopped 

stopclock(); 

showtime(); 

} 

</SCRIPT> 

</HEAD> 

<BODY bgcolor="black" onLoad="startclock(); timerONE=window.setTimeout" scroll="no"> 
<form name="clock" onSubmit="0"> 
<input type="text" name="face" size=13 value=""></font>