resizing browser deforms page layout

Hi experts,
I'm building a web application in asp.net c#
I have wasted a lot of time in styling the application.
I was about to release the version 1.0, but I've figured out one HUGE mistake that cannot solve.
The problem is than when I resize the browser, the div in the right goes below the div on the left, and if I continue resizing, the left div "divides" in the three parts than are inside.
It's very difficult to explain, but maybe in the images you can realize what's happening.

I assume that the problem is in this DIVS
<div style="float:left;">
    <div class="divMapaLeftFull" style="float: left;"></div>
    <div class="divMapaRepeaterFull" style="float: left;"></div>
    <div class="divMapaRightFull" style="float: left;"></div>
</div>

I'm attaching the code of my aspx file and also the master page and the css styles.
Also the images explaining the problem better than me.

All I want is a NORMAL layout, when making smaller the width of the browser (by resizing it) a scrollbar in the bottom of the browser.

Thanks in advance.

Regards,

Leandro Nuñez.
original layoutsmall browser sizemoremore
<%--historicos.aspx--%>
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPageForm.master" AutoEventWireup="true" CodeFile="historicos.aspx.cs" Inherits="workspace_historicos" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <script type="text/javascript"></script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <div style="float: left;">
                <div class="divTrv"></div>
            </div>
            <div style="float:left;">
                <div class="divMapaLeftFull" style="float: left;"></div>
                <div class="divMapaRepeaterFull" style="float: left;"></div>
                <div class="divMapaRightFull" style="float: left;"></div>
            </div>
            <div style="position: absolute; margin-top: -48px; margin-left: 580px">
                <asp:UpdateProgress ID="UpdateProgress1" runat="server" DisplayAfter="5">
                    <ProgressTemplate>
                        <asp:Panel ID="PnProgress" runat="server">
                        </asp:Panel>
                    </ProgressTemplate>
                </asp:UpdateProgress>
            </div>
        </ContentTemplate>
        <Triggers></Triggers>
    </asp:UpdatePanel>
</asp:Content>

<%-- MasterPageForm.master--%>

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPageForm.master.cs" Inherits="MasterPageForm" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Control de flotas - vL1.3</title>
    <asp:ContentPlaceHolder ID="head" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div id="divTop" style="width: 100%; height: 45px;"></div>
    <div id="divPrincipal" style="margin-top:10px">
        <table style="width: 100%;" align="center">
            <tr>
                <td>
                    <div id="divContenido">
                        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
                        </asp:ContentPlaceHolder>
                    </div>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>

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.divMapaLeftFull
{
	background: url(../Global/Imagenes/body_map_full_left.png); 
	background-repeat:no-repeat; 
	width:9px; 
	height:535px;
}
.divMapaRepeaterFull
{
	background: url(../Global/Imagenes/body_map_full_repeater.png);
	background-repeat:repeat-x;
	height:535px;
}
.divMapaRightFull
{
	background: url(../Global/Imagenes/body_map_full_right.png);
	background-repeat:no-repeat;
	width:11px;
	height:535px;
}
.divTrv
{
	width:250px;
	height:535px;
	background: url(../Global/Imagenes/trv_cnt.png);
	background-repeat:no-repeat; 
	overflow:hidden;
}

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LVL 2
LeandronnAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
That's standard table syntax though I don't why you put DIV in there exceot to id your content.  If you have the table, you don't need the DIV unless you are splitting the <td> into smaller blocks.  A big difference between 'div' and 'table' is that tables shrink to wrap around their content while divs take up the whole horizontal space.  You can use <table width="100%"> to make a table do that.  Note that tables have default margins and spacing unless you change them.
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Dave BaldwinFixer of ProblemsCommented:
Yep that's what 'floats' do.  Unless you wrap them in a fixed size container.  Many  of us use something like '#wrapper {width:980px;margin-left: auto; margin-right:auto;} div to 'wrap' the entire page so that doesn't happen.
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LeandronnAuthor Commented:
@DaveBaldwin: First, thanks for your answer
But then I'll be stucked in 980px of the browser width??
If float is wrong, what would be the proper way to put my divs one next to the other?
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Dave BaldwinFixer of ProblemsCommented:
It's not that 'float' is wrong but that is the way it works.  The only other choice is tables because they don't come unstuck from each other.  You can make the width whatever you want, I just picked 980 for an example.
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LeandronnAuthor Commented:
Ok, thanks.
But what would be the correct way?

<table>
<tr>
<td> DIV LEFT </td>
<td> DIV RIGHT </td>
</tr>
</table>

Like that?
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ZadoCommented:
Try add 'display:inline-block;' to both div containers
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jeremyjared74Commented:
For a fluid layout you need to change all of you width dimensions form px to %.
EXAMPLE: instead of width=700px, it would be width= 70%
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