assign database result to iinput text box

I have following html code to show my input text box and php to connect 
server and select result from database server.
I would like to know how I can I use php to assign the value to my input 
text.
Your help and information is great appreciated,

Regards,

Iccsi,

<INPUT type="text" name="Mytxt" id="MytextID" />


<?php
$username = "root";
$password = "myPassword";
$hostname = "localhost";

//connection to the database
$dbhandle = mysql_connect($hostname, $username, $password)
  or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";

//select a database to work with
$selected = mysql_select_db("iccsimd",$dbhandle)
  or die("Could not select aerver");

//execute the SQL query and return records
$result = mysql_query("SELECT invid, invdate, note, amount FROM invheader");