I can't get my update recored script to work.. if anyone can help please do...

This is my link to access the modify record.....
Modify account

What do "tech" and the variable "$username" mean.

Then it's passed off to this script..


do_modify.php
.
.
$sql = "SELECT tusername, password, fname, lname, address1, address2, city, state, zip, phone, email, resume

FROM $table_name
WHERE id = \"$id\"
";
.
.
AND then off to

show_modify.php
.
.
$sql = "UPDATE $table_name
SET
tusername = \"$tusername\",
password = \"$password\",
fname = \"$fname\",
lname = \"$lname\",
address1 = \"$address1\",
address2 = \"$address2\",
postcode = \"$postcode\",
city = \"$city\",
state = \"$state\",
zip = \"$zip\",
phone = \"$phone\",
email = \"$email\",
resume = \"$resume\"

WHERE id = \"$id\"
";
.
.