Uz jsi na teto strance:

 

Do sekce <BODY> umístěte:
<body onload="window.setTimeout('getSecs()',1)">
<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>


<form>
<div align="center"><center><p>Uz jsi na teto strance:<br>
<input name="timespent" size="9"
style="color: rgb(0,255,0); background-color: rgb(0,0,0); font-family: LiquidCrystal; font-size: 15; font-weight: bold; text-align: center;">
</p>
</center></div>
</form>