Run a javascript code on browser close and not on page refresh

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C#

ASP.NET

Javascript

Hi,

I have written a code in javascript ASP.net to do some logic on browser close, i.e., on 'onbeforeunload' event. The code is running pretty fine. But it gets executed on page refresh also. I want the code to be run on browser close only and not on refresh. Below is the jasvascript code that I have written. Can u please help me in the same.......

<script type ="text/javascript">

    window.onbeforeunload = function () {
        if ((window.event.clientX < 0) || (window.event.clientY < 0) || window.event.clientY < -80) {
            var sessionvalue = '<%= Session["UserID"] %>';

            EndSession.saveLogOutTime("Jayanti");
        }
    }
</script>