Maximize minimize and closing coding

HI I i need maximize and minimize and close chatt panel i am using this coding hear please check it and tell me what i need to change

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="userchat.aspx.cs" Inherits="userchat" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<%--

--%>

<%----%>

Height="14px" onclick="btnmin_Click"/>

ImageUrl="~/Images/maxm.png" Height="14px" onclick="btnshow_Click" />

<%----%>

border="0"><%-- style="margin-left: 400px; width: 644px; height: 418px;"456"--%>

--%>

e-krish Chatt room :

ID="Lblsignout" runat="server" OnClick="Lblsignout_Click" CommandArgument='<%#Eval("Group_Id") %>'>SignOut

<%-- --%>


<%--
TextMode="MultiLine" Height="360px" Width="470px" > <%-- margin-left: 0px; margin-top: 0px;" src="TheChatScreenWin.aspx" id="I1" name="I1"></div><div id="pastingspan1"> Chat--%>
Message:

<%-- --%>

<%--

--%>

<%--

--%>

Width="18%"

style="margin-left: 1051px; margin-right: 0px; margin-top: 131px;" >

Chatt Group

AutoGenerateColumns="False" bgcolor="orange" Height="240px"

style="margin-left: 0px" Width="181px"

onrowdatabound="Grdgroup_RowDataBound"

onselectedindexchanged="Grdgroup_SelectedIndexChanged"

AutoExpand="False" CollapseControlID="lnkExpand" Collapsed="True"

CollapsedImage="~/Images/arrow_collapsed1.png"

ExpandControlID="lnkExpand" ExpandDirection="Vertical"

ExpandedImage="~/Images/arrow_expanded1.png"

ImageControlID="imgSeeLess" ScrollContents="False" TargetControlID="pnlSeeMore"

TextLabelID="lnkExpand" >

<%--

OnClientClick="return false;" Width="100px">--%>

Text='<%#Eval("Group_Name") + "(" + Eval("count") + ")"%>'>

<%--

Text='<%#Eval("Group_Name") + "(" + Eval("count") + ")"%>'>--%>

Font-Size="12px" onclick="Lnkusers_Click" CommandName = "Username" >

<%-- CommandArgument='<%#Eval("ID") %>'--%>

<%--View Details--%>

<%--

--%>