In this game:
http://www.youplay.it/play/bm_GameMove.asp?GameID=450838&UserID=flying_neko

Every time I try to move, I get redirected to this page:

http://www.youplay.it/play/cp_message.asp?message=%3C%6F%62%6A%65%63%74%3E%3C%70%61%72%61%6D%20%6E%61%6D%65%3D%22%6D%6F%76%69%65%22%20
<p>%76%61%6C%75%65%3D%22%68%74%74%70%3A%2F%2F%77%77%77%2E%79%6F%75%74%75%62%65%2E%63%6F%6D%2F%76
<p>%2F%6F%48%67%35%53%4A%59%52%48%41%30%26%61%75%74%6F%70%6C%61%79%3D%31%22%3E%3C%2F%70%61%72%61
<p>%6D%3E%3C%65%6D%62%65%64%20%73%72%63%3D%22%68%74%74%70%3A%2F%2F%77%77%77%2E%79%6F%75%74%75%62
<p>%65%2E%63%6F%6D%2F%76%2F%6F%48%67%35%53%4A%59%52%48%41%30%26%61%75%74%6F%70%6C%61%79%3D%31%22
<p>%20%74%79%70%65%3D%22%61%70%70%6C%69%63%61%74%69%6F%6E%2F%78%2D%73%68%6F%63%6B%77%61%76%65%2D
<p>%66%6C%61%73%68%22%20%61%6C%6C%6F%77%73%63%72%69%70%74%61%63%63%65%73%73%3D%22%61%6C%77%61%79
<p>%73%22%20%61%6C%6C%6F%77%66%75%6C%6C%73%63%72%65%65%6E%3D%22%74%72%75%65%22%3E%3C%2F%65%6D%62
<p>
%65%64%3E%3C%2F%6F%62%6A%65%63%74%3E