Hi Kuroi,
You are right, I modified the tpl_main_page.php. The code is as follows ::

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<?php
/**
* Common Template - tpl_main_page.php
*
* Governs the overall layout of an entire page<br />
* Normally consisting of a header, left side column. center column. right side column and footer<br />
* For customizing, this file can be copied to /templates/your_template_dir/pagename<br />
* example: to override the privacy page<br />
* - make a directory /templates/my_template/privacy<br />
* - copy /templates/templates_defaults/common/tpl_main_page.php to /templates/my_template/privacy/tpl_main_page.php<br />
* <br />
* to override the global settings and turn off columns un-comment the lines below for the correct column to turn off<br />
* to turn off the header and/or footer uncomment the lines below<br />
* Note: header can be disabled in the tpl_header.php<br />
* Note: footer can be disabled in the tpl_footer.php<br />
* <br />
* $flag_disable_header = true;<br />
* $flag_disable_left = true;<br />
* $flag_disable_right = true;<br />
* $flag_disable_footer = true;<br />
* <br />
* // example to not display right column on main page when Always Show Categories is OFF<br />
* <br />
* if ($current_page_base == 'index' and $cPath == '') {<br />
* $flag_disable_right = true;<br />
* }<br />
* <br />
* example to not display right column on main page when Always Show Categories is ON and set to categories_id 3<br />
* <br />
* if ($current_page_base == 'index' and $cPath == '' or $cPath == '3') {<br />
* $flag_disable_right = true;<br />
* }<br />
*
* @package templateSystem
* @copyright Copyright 2003-2006 Zen Cart Development Team
* @copyright Portions Copyright 2003 osCommerce
* @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
* @version $Id: tpl_main_page.php 3183 2006-03-14 07:58:59Z birdbrain $
*/

// the following IF statement can be duplicated/modified as needed to set additional flags
if (in_array($current_page_base,explode(",",'list_pages_to_skip_all_right_sideboxes _on_here,separated_by_commas,and_no_spaces')) ) {
$flag_disable_right = true;
}

$header_template = 'tpl_header.php';
$footer_template = 'tpl_footer.php';
$left_column_file = 'column_left.php';
$right_column_file = 'column_right.php';
$body_id = str_replace('_', '', $_GET['main_page']);
?>
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" id="<?php echo $body_id . 'Body'; ?>"<?php if($zv_onload !='') echo ' onload="'.$zv_onload.'"'; ?> onunload="GUnload();">
<div id="mainWrapper">
<table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td align="left" valign="top">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr align="left" valign="top">
<td bgcolor="#E5C2D5"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="125" align="left" valign="top">
<?php
/**
* Common Template - tpl_header.php
*
* this file can be copied to /templates/your_template_dir/pagename<br />
* example: to override the privacy page<br />
* make a directory /templates/my_template/privacy<br />
* copy /templates/templates_defaults/common/tpl_footer.php to /templates/my_template/privacy/tpl_header.php<br />
* to override the global settings and turn off the footer un-comment the following line:<br />
* <br />
* $flag_disable_header = true;<br />
*
* @package templateSystem
* @copyright Copyright 2003-2006 Zen Cart Development Team
* @copyright Portions Copyright 2003 osCommerce
* @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
* @version $Id: tpl_header.php 3392 2006-04-08 15:17:37Z birdbrain $
*/
?>
<?php
// Display all header alerts via messageStack:
if ($messageStack->size('header') > 0) {
echo $messageStack->output('header');
}
if (isset($_GET['error_message']) && zen_not_null($_GET['error_message'])) {
echo htmlspecialchars(urldecode($_GET['error_message']));
}
if (isset($_GET['info_message']) && zen_not_null($_GET['info_message'])) {
echo htmlspecialchars($_GET['info_message']);
} else {

}
?>
<!--bof-header logo and navigation display-->
</td>
</tr>
<tr>
<td align="left" valign="middle"> &nbsp;&nbsp;&nbsp;ok</td>
</tr>
</table></td>
<td width="347" background="../images/newtopback.jpg">&nbsp; </td>
<td width="254" align="right"><img src="../images/pradhantemp.jpg" width="254" height="198"></td>
</tr>
<tr align="left" valign="top" bgcolor="#B6156B">
<td height="30" colspan="3">
<!--bof-navigation display-->
<div id="navMainWrapper"> <div id="navMain">
<ul class="back">
<li><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'; ?><?php echo HEADER_TITLE_CATALOG; ?></a><font color="#FFFFFF">
|| </font></li>
<?php if ($_SESSION['customer_id']) { ?>
<li><a href="<?php echo zen_href_link(FILENAME_LOGOFF, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGOFF; ?></a><font color="#FFFFFF">
|| </font></li>
<li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><?php echo HEADER_TITLE_MY_ACCOUNT; ?></a><font color="#FFFFFF">
|| </font></li>
<!--bof-header ezpage links-->
<li>
<?php if (EZPAGES_STATUS_HEADER == '1' or (EZPAGES_STATUS_HEADER == '2' and (strstr(EXCLUDE_ADMIN_IP_FOR_MAINTENANCE, $_SERVER['REMOTE_ADDR'])))) { ?>
<?php require($template->get_template_dir('tpl_ezpages_bar_header.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_ezpages_bar_header.php'); ?>
<?php } ?></font>
</li>
<!--eof-header ezpage links-->
<?php
} else {
if (STORE_STATUS == '0') {
?>
<li><a href="<?php echo zen_href_link(FILENAME_LOGIN, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGIN; ?></a><font color="#FFFFFF">
|| </font></li>
<!--bof-header ezpage links-->
<li>
<?php if (EZPAGES_STATUS_HEADER == '1' or (EZPAGES_STATUS_HEADER == '2' and (strstr(EXCLUDE_ADMIN_IP_FOR_MAINTENANCE, $_SERVER['REMOTE_ADDR'])))) { ?>
<?php require($template->get_template_dir('tpl_ezpages_bar_header.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_ezpages_bar_header.php'); ?>
<?php } ?></font>
</li>
<!--eof-header ezpage links-->
<?php } } ?></div>
<div class="navMainSearch forward">
<?php if ($_SESSION['cart']->count_contents() != 0) { ?>
<a href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php echo "<font ############################## size=2>Show My ".HEADER_TITLE_CART_CONTENTS."</font>"; ?>&nbsp;&nbsp;&nbsp;<img src="../includes/templates/sage/images/temp_cart.jpg">&nbsp;&nbsp</a>&nbsp;&nbsp;&nbsp;<br>
<a href="http://pradhanflorist.com/index.php?main_page=checkout_payment_address"><?php echo "<font ############################## size=2>Change Delivery Address</font>"; ?>&nbsp;&nbsp;<img src="../includes/templates/sage/images/temp_cart.jpg">&nbsp;&nbsp;</a>&nbsp;&nbsp;&nbsp;<br>
<a href="<?php echo zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>"><?php echo "<font ############################## size=2>Go To ".HEADER_TITLE_CHECKOUT."</font>"; ?>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;<img src="../includes/templates/sage/images/checkout.gif">&nbsp;&nbsp;</a><br>
<a href="http://pradhanflorist.com/index.php?main_page=logoff"><?php echo "<font ############################## size=2>Log Out Here</font>"; ?></a>&nbsp;&nbsp;&nbsp;<br>
<?php }?>
</ul>
<?php //require(DIR_WS_MODULES . 'sideboxes/search_header.php'); ?>
</div>
<br class="clearBoth" /> </div>
<!--eof-navigation display-->
<!--eof-header logo and navigation display-->
<!--bof-optional categories tabs navigation display-->
<?php //require($template->get_template_dir('tpl_modules_categories_tabs.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_categories_tabs.php'); ?>
<!--eof-optional categories tabs navigation display--></div></td></tr>
</table></td></tr>
<tr>
<td align="left" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0" id="contentMainWrapper">
<tr>
<td align="left" valign="top" class="columnLeft" id="navColumnOne" style="width: <?php echo COLUMN_WIDTH_LEFT; ?>">&nbsp;</td>
<td width="622" align="left" valign="top">&nbsp;</td>
</tr>
<tr>
<?php

if (COLUMN_LEFT_STATUS == 0 or (CUSTOMERS_APPROVAL == '1' and $_SESSION['customer_id'] == '')) {
// global disable of column_left
$flag_disable_left = true;
}
if (!isset($flag_disable_left) || !$flag_disable_left) {
?>
<td width="200" align="left" valign="top" class="columnLeft" id="navColumnOne" style="width: <?php echo COLUMN_WIDTH_LEFT; ?>">
<?php
/**
* prepares and displays left column sideboxes
*
*/
?>
<div id="navColumnOneWrapper" style="width: <?php echo BOX_WIDTH_LEFT; ?>" align="left">
<?php require(DIR_WS_MODULES . zen_get_module_directory('column_left.php')); ?>
</div></td>
<?php
}
?>
<td align="left" valign="top">
<!-- bof breadcrumb -->
<?php if (DEFINE_BREADCRUMB_STATUS == '1' && ($current_page!='index' || (int)$cPath>0 ))
{ ?>
<div id="navBreadCrumb"><?php echo $breadcrumb->trail(BREAD_CRUMBS_SEPARATOR); ?></div>
<? } ?>
<? // include "flash.php"; ?>
<!-- eof breadcrumb -->
<?
if (SHOW_BANNERS_GROUP_SET3 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET3))
{
if ($banner->RecordCount() > 0)
{ ?>
<div id="bannerThree" class="banners">
<? echo zen_display_banner('static', $banner); ?>
</div>
<?
}
}
?>
<?php
/**
* prepares and displays center column
*
*/
require($body_code); ?>
<?php
if (SHOW_BANNERS_GROUP_SET4 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET4))
{
if ($banner->RecordCount() > 0)
{
?>
<div id="bannerFour" class="banners">
<? echo zen_display_banner('static', $banner); ?>
</div>
<?php
}
}
?>
<!--div id="navColumnTwoWrapper" style="width: <?php echo BOX_WIDTH_RIGHT; ?>"></div--></td>
<?php
if (COLUMN_RIGHT_STATUS == 0 or (CUSTOMERS_APPROVAL == '1' and $_SESSION['customer_id'] == ''))
{
// global disable of column_right
$flag_disable_right = true;
}
if (!isset($flag_disable_right) || !$flag_disable_right)
{
?>
<?php
}
?>
</tr>
</table></td>
</tr>
</table>
<?php
/**
* prepares and displays footer output
*
*/
require($template->get_template_dir('tpl_footer.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_footer.php');?>
<!--bof- parse time display -->
<?php
if (DISPLAY_PAGE_PARSE_TIME == 'true') {
?>
<div class="smallText center">Parse Time: <?php echo $parse_time; ?> - Number of Queries: <?php echo $db->queryCount(); ?> - Query Time: <?php echo $db->queryTime(); ?></div>
<?php
}
?>
<!--eof- parse time display -->
<!--bof- banner #6 display -->
<!--eof- banner #6 display -->
</body>

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Will you please help me where is my wrongs?

With Best Regards,
WDH