Java script validation

Java script validation

<script type="text/javascript">

        function validate()
        {
            if (document.getElementById("<%=txtid.ClientID%>").value=="")
            {
                alert("Name Feild can not be blank");
                document.getElementById("<%=txtid.ClientID%>").focus();
                return false;
               
               
            }
            else
            {
              
                    if (confirm("Are you sure you want to Save this user?"))
                        return true;
                    else
                        return false;
               
            }
          
           
        }
    </script>