CSS - What Is Inferior About Building A Site Using Dreamweaver & Nested Tables & Not Css?

<table class="nicetable">
	<?php include "header.html" ?> <!-- This is one table row, the table has two td's-->
	<tr>
		<td height="410">
			<table class="nicesubnavtable">
				<tr>
					<td id="subnavtop">
						<script language="JavaScript1.2" type="text/javascript">
							<!--
							myTest.writeMenuBar();
							//-->
						</script>								
					</td>
				</tr>
				<tr>
					<td id="subnavbottom">
<?php

$sql = "SELECT * FROM SubGroup WHERE GroupID = '$GroupID'"; 
$result = mysql_query($sql) or die (mysql_error()."<br />Couldn't execute query: $sql");
$num_results = mysql_num_rows($result);
						echo "<br>";
						for($i=0; $i < $num_results; $i++){
							$row = mysql_fetch_array($result);
							$tempSubGroupID = $row['SubGroupID'];
							$tempName =	stripslashes($row['Name']);
							if($SubGroupID == $tempSubGroupID){
								echo "<a id='snsgnamesblue' href='subnav.php?SubGroupID=$tempSubGroupID'>$tempName</a>";
							}
							else{
								echo "<a id='snsgnames' href='subnav.php?SubGroupID=$tempSubGroupID'>$tempName</a>";
							}
						}
?>
					</td>
				</tr>
			</table>
		</td>
		<td id="mainareanav">
<?php					

$sql1 = "SELECT * FROM IndividualItem WHERE SubGroupID = '$SubGroupID'"; 
$result1 = mysql_query($sql1) or die (mysql_error()."<br />Couldn't execute query: $sql");
$num_results1 = mysql_num_rows($result1);

						for($i=0; $i < $num_results1; $i++){
							$row = mysql_fetch_array($result1);
							$tempItemID = $row['ItemID'];
							$tempNickName =	stripslashes($row['NickName']);
							$filename = stripslashes($row['ThumbImageName']);
							$filenamearray = explode('.', $filename);
							$fnameNoExt = $filenamearray[0];
							
							//print the nickname, if no nickname print the itemID
							if($tempNickName == "")	echo "<a id=\"itemnames\" href=\"product.php?itemID=$tempSubGroupID\" onMouseover=\"changeit('pic1','$fnameNoExt');\" onMouseout=\"changeit('pic1','image_off');\">$tempItemID</a> \n";
							else echo "<a id=\"itemnames\" href=\"product.php?itemID=$tempSubGroupID\" onMouseover=\"changeit('pic1','$fnameNoExt');\" onMouseout=\"changeit('pic1','image_off');\">$tempNickName</a> \n";
						}
//<td id="subnavright">
//<img src="images/thumb/blankthumb.jpg" id="thumb" name="pic1">
//</td>						
						
?>
		</td>
	</tr>
	
	<?php include "footer.html" ?> <!-- This is three table rows, public links, user links, search and contact-->
 </table>

body {
	font-family : Arial, Helvetica, sans-serif;
	font-size: 16px;
	margin: 0; 
	padding: 0

}
.nicetable {
	border-collapse:collapse;
}
.nicesubnavtable {
	border-collapse:collapse;
	width: 200px;
	margin: 0px;
	padding: 0px;
	border-bottom: 2px solid #BAB6B7;
}


#subnavbar {
	vertical-align: top;	
}

#subnavmiddle {
	background-color: white;
	width: 220px;
	height: 410px;
	vertical-align: top;
	padding-left: 15px;
}

#subnavright{
	width: 240px;
	vertical-align: top; 
	border-right: 1px solid #797D7E
}

#subnavtop{
	background-color: #F3D891;
	height: 60px;	
	width: 185px;
	border-top: 2px solid #F3D891;
	border-left: 2px solid #F3D891;
}

#subnavbottom{
	background-color: #FAE1A8;
	height: 350px;
	width: 185px;	
	padding-right: 15px;
	border-left: 2px solid #FAE1A8;
	vertical-align: top;
}

/* mp_tip_CSS_x_TABLE CSS */
<?
for ($i=1; $i<=12; $i++) {
?>
#mp_tip_CSS_<? echo($i); ?>_table {
border-color: <? echo($mp_tip_CSS_table_border_color[$i]); ?>;
border-style: <? echo($mp_tip_CSS_table_border_style[$i]); ?>;
border-width: <? echo($mp_tip_CSS_table_border_width[$i]."px"); ?>;
border-collapse: collapse;
}
#mp_tip_CSS_<? echo($i); ?>_table td {
border-color: <? echo($mp_tip_CSS_table_border_color[$i]); ?>;
border-style: <? echo($mp_tip_CSS_table_border_style[$i]); ?>;
border-width: <? echo($mp_tip_CSS_table_border_width[$i]."px"); ?>;
border-collapse: collapse;
} 
<? } ?>
/* mp_tip_CSS_x_TABLE CSS END */

#classname >tr >td {}