problem with ajax and the path to the php page

To use the WordPress ajax url you can pass the var using wp_localize_script:

wp_enqueue_script( 'functions', get_bloginfo( 'stylesheet_directory' ) . '/js/functions.js', array( 'jquery' ), false);
    wp_localize_script( 'functions', 'MyAjax', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) ) );

In your functions.js

        $.ajax({
                type: "POST",
                url:  MyAjax.ajaxurl,
                data: {p:alt_p},
                success: function(data) {
                    alert(data);
                }
            });

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