Display results in a text box to be edited for update query

Hello, I'm trying to display the results of my query in a text box so that they can be edited, if need be, and updated in the database.  I'm getting the error below, with the code below.  I've tried a couple of different ways to format the "value" of the text box as you can see by the second one that's commented out and still a no go.  Thanks for any help in advance guys.

The error below is referring to the code just below here.

echo "<td><input type="text" name="firstname" value="$firstname"></td>";

Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in C:\

$rs=odbc_exec($conn,$sql);
if (!$rs)
  {exit("Error in SQL");}
echo "<table><tr>";
echo "<th>First Name</th>";
echo "<th>Middle Initial</th>";
echo "<th>Last Name</th>";
echo "<th>Full Name</th>";
echo "<th>Provider ID</th></tr>";
while (odbc_fetch_row($rs))
  {
  $firstname=odbc_result($rs,"provider_first_name");
  $middleinitial=odbc_result($rs,"provider_middle_name");
  $lastname=odbc_result($rs,"provider_last_name");
  $fullname=odbc_result($rs,"provider_full_name");
  $provider_id=odbc_result($rs,"provider_id");
 
 
 
  echo "<tr><td>$firstname</td>";
  echo "<td><input type="text" name="firstname" value="$firstname"></td>";
  echo "<td>$middleinitial</td>";
  echo "<td>$lastname</td>";
  echo "<td>$fullname</td>";
  echo "<td>$provider_id</td>";
 // echo "<td><input type="text" name="textfield" value='".$providerid."'"></td>";
  echo "<td>$providerid</td></tr>";
  }
odbc_close($conn);