I am not in the codex developing community but I noticed a missing assignment statement in a function, perhaps you could pass this along.
in the section "The Whole Function"
the second function, jal_install_data()
doesn't set the variable for $table_name
so it doesn't work. It won't insert data, as is.
you have to modify it by adding this line
$table_name = $wpdb->prefix."liveshoutbox";
Could be frustrating to someone. Because otherwise it works beautifully.
Sorry if this is in the wrong place.