clear or hide text of asp.net label contrl using javascript

copy the below snippets in head section of page and change the control id as per use

<script type="text/javascript">  
    function resetlabel() {
        document.getElementById('<%=Notification.ClientID%>').innerHTML= "";
        document.getElementById('<%=lblextMsg.ClientID%>').innerHTML = "";
    } setTimeout(resetlabel, 2000);
</script>