how can call java script function on button click in vb.net
<script language="JavaScript">
function btnClick()
{
if( divCalendar.style.display == "none")
divCalendar.style.display = "";
else
divCalendar.style.display = "none";
}
</script>
<asp:Button ID="Button2" runat="server" Text="..." style="z-index: 100; left: 496px; position: absolute; top: 199px" />