This is the Javascript code to show an alert if users keep the web page open & unattended for more than 10 minutes.
----------------------------------------------------------------------------------------------------------------------------------
<BODY onload="pageload();">
----------------------------------------------------------------------------------------------------------------------------------
function pageload()
{
window.setInterval("SetAlert()",480000);
}
----------------------------------------------------------------------------------------------------------------------------------
function SetAlert()
{
//In my example alert is on the same page. You can embed another .html page also here.
document.getElementById('divSession').style.display='';
document.getElementById('divSession').style.posTop=200;
document.getElementById('divSession').style.posLeft=250;
document.getElementById('divSession').style.width=430;
document.getElementById('divSession').style.height=130;
window.setInterval("document.getElementById('divSession').style.display='none'",115000);
}
----------------------------------------------------------------------------------------------------------------------------------
<
div id="divSession" runat="server" style="DISPLAY: none; Z-INDEX: 101; BORDER-LEFT-COLOR: whitesmoke; LEFT: 600px; BORDER-BOTTOM-COLOR: whitesmoke; WIDTH: 248px; BORDER-TOP-STYLE: ridge; BORDER-TOP-COLOR: whitesmoke; FONT-FAMILY: 'Times New Roman'; BORDER-RIGHT-STYLE: ridge; BORDER-LEFT-STYLE: ridge; POSITION: absolute; TOP: 25px; HEIGHT: 198px; BACKGROUND-COLOR: lightgrey; BORDER-RIGHT-COLOR: whitesmoke; BORDER-BOTTOM-STYLE: ridge"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td valign="middle">
<p align="center"><br>
You are not browing this site from 10 minutes. <!--Anything can go here-->
<br>
<INPUT type='submit' value='OK' onClick='CloseWin()' style="WIDTH: 103px" ID="Submit1"
NAME="Submit1">
</p>
</td>
</tr>
</table>
</div>
----------------------------------------------------------------------------------------------------------------------------------
function CloseWin()
{
//Anything you can write here.
document.getElementById('divSession').style.display='none';}