function SearchJob() {
    var what_job = document.getElementById('what_job');
    var where_job = document.getElementById('where_job');
    
    if (what_job.value.length==0 && where_job.value.length==0) {
        alert('Riempire almeno un campo');
        return false;
    } else {
        window.open('http://lavoro.unionesarda.it?cosa=' + what_job.value + '&dove=' + where_job.value);
    }
}