So how would you rewrite this code to do the proper action:
$gName = htmlspecialchars(addslashes($_POST["editName"]));
$gAmount = $_POST["editAmount"];
$gDate = date("d/m-Y");
if(!empty($gName) && !empty($gAmount)) {
$editId = $_GET["edit"];
$getCurrentAmount = mysql_query("SELECT amount FROM guilt_list WHERE id = $editId") or die(mysql_error());
$amountIsCurrently = mysql_fetch_row($getCurrentAmount);
$listAmount = $amountIsCurrently+$gAmount;
mysql_query("UPDATE guilt_list SET name='$gName', amount='$listAmount' WHERE id='$editId'");
mysql_query("INSERT INTO guilt_changes(id, amount, date) VALUES('$editId', '$gAmount', '$gDate')") or die(mysql_error());
echo "<h2>Success: The guilt that ".$gName." owes has been edited!</h2>";
echo "<div style=\"width: 680px; margin: 10px 0 10px 0\"> </div>";
}