var trackerUrl = 'http://emporaads.appspot.com/?client=' +  empora_ad_client + '&type=' + (empora_ad_flash ? 'flash' : 'image' ) + '&file=banner_' + empora_ad_width + '_' + empora_ad_height + '&version=1';
document.write( '<iframe height="1" width="1" src="' + trackerUrl + '" frameborder="0" style="position: absolute; left: -999px; top: -999px; visibility:hidden"></iframe>' );