ord=Math.random()*10000000000000000;
document.write('<iframe src="http://ad.doubleclick.net/adi/us.terra.anxaejercicios/gral;tile=1;sz=300x250;ord=' + ord + '?" width="300" height="250" marginwidth="0" marginheight="0" hspace="0" vspace="0" frameborder="0" scrolling=no borderCOLOR="#000000">');
document.write('<script language="JavaScript" src="http://ad.doubleclick.net/adj/us.terra.anxaejercicios/gral;tile=1;sz=300x250;abr=!ie;ord=' + ord + '?" type="text/javascript"><\/script>');
document.write('</iframe>');