// JavaScript Document	
    $(function () {
        var cat = $('#region');
        var el = $('#province');
        var attr = $('#city');
        
        el.selectChain({
            target: attr,
            url: 'http://www.wjjf.it/wp-content/plugins/ipl/provincie.php',
            data: { ajax: true, anotherval: "anotherAction" }            
        });        

        // note that we're assigning in reverse order
        // to allow the chaining change trigger to work
        cat.selectChain({
            target: el,
            url: 'http://www.wjjf.it/wp-content/plugins/ipl/regioni.php',
            data: { ajax: true }
        }).trigger('change');

    });