Was is the syntax error on the first line in this (html website code)?

[jimmy]

document.write ('<' + 'script language='javascript' type='text/javascript' src='');
document.write ('http://www.claxonmedia.com/adserve_rot.php?n=' + phpAds_random);
document.write ('&invoke=js');
document.write ('&what=');
document.write ('&type=leader');
document.write ('&aff=edbri871');
document.write ('&exclude=' + document.phpAds_used);
if (document.referer)
document.write ('&referer=' + escape(document.referer));
document.write (''><' + '/script>');