selecting from MSSQL using variable from $_POST not working

Troubles abound.

What I am trying to achieve is to populate a form using data from a MSSQL database.

First, the user will select a company from a dropdown list **WORKING**

Then, the company name will appear on the form **WORKING**

Now, as the code is set below, the Customer Number, Address, etc WILL populate, but only from the last record in the database.

While the company name will change upon selection of the dropdown menu, everthing else remains the same.

I am using $_POST to populate the company name from the dropdown.

Here is my code:

echo "<table border ='0' width='90%'><tr><td align='center'><strong><font size='4'><font color='#008301'>Load Customer</font></strong></td></tr></table>";
echo "<table border ='1' width='90%'><tr><td>";
echo "<form method=\"post\" action='salesquote.php'>";
echo "<select name=\"pcsname\">";			
echo "<option>Select Company</option>";
$sql="select csname, cscode from customer
where sacode = $sacode 
order by csname";
				
    $rs=odbc_exec($conn,$sql);
    if (!$rs)
    echo"Error in SQL";

	while(odbc_fetch_row($rs))
        {
	  $csname=odbc_result($rs,"csname");
	  echo "<option value=\"$csname\">$csname</option>";
	}
		
		echo "</select>";	
		echo "<input type=\"submit\">";
		echo "</form>";
		echo "</td></tr>";
		echo "</table>";
		echo "</form>";
		echo "</tr></table>"; 
		echo "<br />";
  	odbc_close($conn);
echo "<table border ='0' width='100%'><tr><td align='center'><strong><font size='4'><font color='#008301'>Quote Information</font></strong></td></tr></table>";
echo "<table border ='1' width='100%'>";	
echo "<tr><td>Quote Date</td>";
echo "<td>";
echo date("F d, Y"); 
echo "</td></tr>";
echo "<tr><td>Inquiry Date</td>";
echo"<td><input type='text' size='20'></td></tr>";
echo "<tr><td>Sales Person $pcscode</td>";
echo "<td>";
?><?php include 'addons/loginArray.php';?><?php
echo "</td></tr>";
echo "</table>"; 
echo "<br />";
		
echo "<table border ='0' width='100%'><tr><td align='center'><strong><font size='4'><font color='#008301'>Customer Information</font></strong></td></tr></table>";
echo "<table border ='1' width='100%'>";
include 'addons/connection.php';
    $sql="select cscode, csphone, csaddr1, csaddr2, cscity, csst, cszip from customer
    where sacode = $sacode				
    order by csname";				

      $rs=odbc_exec($conn,$sql);
      if (!$rs)
        echo"Error in SQL";

      while(odbc_fetch_row($rs))
       {
			
	$cscode=odbc_result($rs,"cscode");
	$csphone=odbc_result($rs,"csphone");
	$csaddr1=odbc_result($rs,"csaddr1");
	$csaddr2=odbc_result($rs,"csaddr2");
	$cscity=odbc_result($rs,"cscity");
	$csst=odbc_result($rs,"csst");
	$cszip=odbc_result($rs,"cszip");	
      }
  					
  					
        echo "<tr><td width=\"40%\">Customer Number</td>";
  	echo"<td>$cscode</td></tr>";
  	echo "<tr><td>Company Name</td>";
  	echo "<td>$pcsname</td></tr>";
  	echo "<tr><td>Customer Phone</td>";
  	echo "<td>$csphone</td></tr>";
  	echo "<tr><td>Address 1</td>";
  	echo "<td>$csaddr1</td></tr>";
  	echo "<tr><td>Address 2</td>";
  	echo "<td>$csaddr2</td></tr>";
  	echo "<tr><td>Address 3</td>";
  	echo "<td>$cscity  $csst $cszip</td></tr>";
  odbc_close($conn);
echo "</table>"; 

If, however, I do somethiong like this:

 $sql="select cscode, csphone, csaddr1, csaddr2, cscity, csst, cszip from customer
    where sacode = $sacode				
    and
    csname = $pcsname";

I would expect this to give me the required information by referencing the company name already set above.

Instead, I get an SQL ERROR

Again, if I remove the line: csname = $pcsname I get the last record in the databse associated with $sacode.

any thoughts?

Thank you in advance