jquery does’t work

The answer is obvious. The jQuery is loaded in noConflict mode. It means that the global $ shortcut for jQuery is not available. You have to use closure, like this:

(function($) {
    $(document).ready(function() {
        $('#slider').coinslider({
            width: 948,
            height: 367
        });
    });
})(jQuery);

In addition I would like to recommend you to create hook handler for wp_enqueue_scripts action. You need to enqueue jquery in this hook. In this case you will enqueue jquery only for frontend. Like following:

add_action( 'wp_enqueue_scripts', 'wpse8170_enqueue_scripts' );
function wpse8170_enqueue_scripts() {
    wp_enqueue_script('jquery');
}