i just barely noticed this, there's like a huge block of text on my error log containing this. what does this mean?

[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:40] WARNING: 2010-06-18 06:02:40 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)
[18-Jun-2010 06:02:41] WARNING: 2010-06-18 06:02:41 (PDT): "parse_url(////?pg=http://tjdhosp.co.kr/data/session/byz9991.txt???) [<a href='function.parse-url'>function.parse-url</a>]: Unable to parse URL" in file /home/manacim/public_html/engine/lib/elgglib.php (line 2646)