Como dice el titulo aparece un icono diciendo cuanto tiempo llevas en la we asignada
<HTML>
<HEAD>
<TITLE></TITLE> <SCRIPT LANGUAGE="JavaScript">
<!--
var hour = "0"
var min = "00"
var sec = "0"
function timer(){
if ((min < 10) && (min != "00")){
dismin = "0" + min
}
else{
dismin = min
}
dissec = (sec < 10) ? sec = "0" + sec : sec
document.timer.counter.value = hour + ":" + dismin + ":" + dissec
if (sec < 59){
sec++
}
else{
sec = "0"
min++
if (min > 59){
min = "00"
hour++
}
}
window.setTimeout("timer()",1000)
}
// -->
</SCRIPT>
</HEAD>
<BODY ONLOAD="timer()">
<FORM NAME="timer">
<P><FONT SIZE="-1" FACE="Arial">Llevas en esta página
</FONT><INPUT TYPE="TEXT" NAME="counter"></P></FORM> <BR>
<P>
</HTML>
<HTML>
<HEAD>
<TITLE></TITLE> <SCRIPT LANGUAGE="JavaScript">
<!--
var hour = "0"
var min = "00"
var sec = "0"
function timer(){
if ((min < 10) && (min != "00")){
dismin = "0" + min
}
else{
dismin = min
}
dissec = (sec < 10) ? sec = "0" + sec : sec
document.timer.counter.value = hour + ":" + dismin + ":" + dissec
if (sec < 59){
sec++
}
else{
sec = "0"
min++
if (min > 59){
min = "00"
hour++
}
}
window.setTimeout("timer()",1000)
}
// -->
</SCRIPT>
</HEAD>
<BODY ONLOAD="timer()">
<FORM NAME="timer">
<P><FONT SIZE="-1" FACE="Arial">Llevas en esta página
</FONT><INPUT TYPE="TEXT" NAME="counter"></P></FORM> <BR>
<P>
</HTML>