/**
 * setup global envirnoment
 */
function global_setup()
{ 
  // setup ajax defaults 
  $j.ajaxSetup({
    contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
    url: url_site + "ajax.php",
    cache: false,
    timeout: 5000 
  });
  
  // global ajax animation      
  img_loading = '<img src="' + url_media + 'layout/ajax-loader.gif" title="...loading..." />';      
}