js browser

<script type="text/javascript">

function Browser()
	{
    if((navigator.userAgent.indexOf("MSIE") != -1 ) || (!!document.documentMode == true )) //IF IE > 10
    {
      alert('Remember to activate your copy of Windows');
    }
    else
    {
       alert('Take it easy. Keep suring');
    }
    }
    window.onload=Browser();
</script>