How to fix the limit on TextBox using Javascript code ?

Here is the simple JavaScript code to do this task

<%@ Page Title=”” Language=”C#” MasterPageFile=”~/MasterPage.master” AutoEventWireup=”true” CodeFile=”JavaScriptTest.aspx.cs” Inherits=”Default2″ %>

<asp:Content ID=”Content2″ ContentPlaceHolderID=”ContentPlaceHolder1″ Runat=”Server”>
<asp:TextBox ID=”txt_HeadLine” onkeyup=”chkmsg1(‘txt_HeadLine’)”  runat=”server” Height=”97px” TextMode=”MultiLine”
&nbsp;<asp:Label ID=”lbl_HeadlineCount” runat=”server” Text=””></asp:Label>

<script language=”javascript”>

function chkmsg1(as) {
var a = document.getElementById(‘<%=txt_HeadLine.ClientID%>’).value.length;
var len = document.getElementById(‘<%=txt_HeadLine.ClientID%>’).value.length;
var str = document.getElementById(‘<%=txt_HeadLine.ClientID%>’).value;

a = parseInt(a);
a = 75 – a;

if (a >= 0) {
document.getElementById(‘<%=lbl_HeadlineCount.ClientID%>’).innerHTML = a + ‘ Remaining’;
else {
var x = str.substring(0, 75);
document.getElementById(‘<%=txt_HeadLine.ClientID%>’).value = x;
return true;




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