JavaScript Stay time

Stay time

<script>
startday = new Date();
clockStart = startday.getTime();
function initStopwatch() {
 var myTime = new Date();
 var timeNow = myTime.getTime();
 var timeDiff = timeNow - clockStart;
 this.diffSecs = timeDiff/1000;
 return(this.diffSecs);
}
function getSecs() {
 var mySecs = initStopwatch();
 var mySecs1 = ""+mySecs;
 mySecs1= mySecs1.substring(0,mySecs1.indexOf(".")) + " secs.";
 document.forms[0].timespent.value = mySecs1
 window.setTimeout('getSecs()',1000);
}
</script>
</head>
<body onLoad="window.setTimeout('getSecs()',1)">
<form><input size=9 name=timespent></form>