tag = document.getElementById('span_city'); tag.innerHTML = " "; function show_area(city_id) { tag = document.getElementById('script_area'); if(tag!=null) { tag.src = 'http://yp.pchome.net/class/show_area.php?city_id='+city_id; } tag = document.getElementById('script_dealer'); if(tag!=null) { tag.src = 'http://yp.pchome.net/class/show_dealer.php?city_id='+city_id; } }