PHP Form IF Issues - php

Question

Ok, so I have this in the top part of my code
require(__DIR__ . "/lib/db.php");
if (!empty($_POST["action"])) {
if ($_POST["action"] == "addCat") {
echo "Please wait...";
$sql1 = "INSERT INTO categories (name) VALUES ('".$_POST["name"]."')";
if (mysql_query($sql1)) {
$success = true;
}
if (!isset($success)) {
echo "Error Occured Adding Category!";
} else {
echo "Category added!";
}
}
if ($_POST["action"] == "delCat") {
echo "Please wait...";
$catNames = $_POST['catName'];
if(empty($catNames)) {
return;
} else {
$N = count($catNames);
for($i=0; $i < $N; $i++) {
$sql = "DELETE FROM categories WHERE id='$catNames[$i]'";
if (mysql_query($sql)) {
$success = true;
}
$sql2 = "SELECT * FROM catrel WHERE categoryID = '$catNames[$i]'";
if (mysql_query($sql2)) {
mysql_query("DELETE FROM catrel WHERE categoryID = '$catNames[$i]'");
}
}
}
if (!isset($success)) {
echo "Could not delete category! Error Occured!";
} else {
echo "Category deleted!";
}
}
}
I have a 2 different forms in the same page, with hidden values that will push addCat or delCat. For some reason it seems like the SQL is not getting parsed, however it is not displaying any errors. Any help would be highly appreciated. I can post the entire page if needed.