asp:linkbutton not getting clicked in Google Chrome and Mozilla Firefox

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C#

ASP.NET

In my web application the asp:linkbutton is not getting clicked in Google Chrome and Mozilla Firefox. It appears as a text in both the browsers. But the button is working fine in Internet Explorer.

<div class="wrapper">
            <div class="header">
                <Bewise:FlashControl ID="FlashControl1"  runat="server" Height="300px" Loop="True" MovieUrl="~/Flash/AMs1.swf" SwLiveConnect="True" Width="1074px" />
            </div>
            <div id="nav">
                <div id="nav_wrapper">
                    <ul>
                        <li><a href="Home.aspx">Home</a></li><li>
                            <a href="Gallery.aspx">Gallery</a></li><li>
                            <a href="AboutUs.aspx">About Us</a></li><li>
                            <a href="ContactUs.aspx">Contact Us</a></li><li>
                            <a href="Feedback.aspx">Feedback</a></li><li>
                            <a href="Account.aspx">Account</a></li>
                    </ul>
                    <div id="Login" style="text-align: right; height: 0px; width: 85px;">
                        <asp:Label ID="lblLogin" runat="server" ForeColor="White" Text=""></asp:Label>
                          
                        <br />
                        <asp:LinkButton ID="LinkButton1" Font-Underline="false" CausesValidation="false" ValidationGroup="false" runat="server" ForeColor="White" OnClick="LinkButton1_Click">LinkButton</asp:LinkButton>
                           
                    </div>
                </div>
            </div>

This above code is my master page. And below is the code behind file:

using System;
using System.Linq;

public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        using (AppointmentDataContext context = new AppointmentDataContext())
        {
            // Checks if a user is logged in
            if (Session["login"] != null)
            {
                var query = (from p in context.Accounts
                             where p.Email == Session["login"].ToString()
                             select p.Name).FirstOrDefault();

                lblLogin.Text = "Welcome " + query.Trim();
                lblLogin.Visible = true;
                LinkButton1.Text = "Logout";
            }

            else
            {
                lblLogin.Visible = false;
                LinkButton1.Text = "Login";
            }
        }
    }

    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        // User logs in
        if (LinkButton1.Text == "Login")
        {
            Response.Redirect("~/Login.aspx");
        }

        else
        {
            // User logs out
            Session.Clear();
            Response.Redirect("~/Home.aspx");
        }
    }
}