Encontre en algunas paginas para codificar HTML y este es el resultado
Código HTML:
<script>
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document.write(unescape("%3Chtml%3E%0A%3Chead%3E%0A%3Cscript%
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A%253C%2521--%250Adocument.write%2528unescape%2528%2522%252
53Cscript%252520language%25253DJavaScript%25253Em%25253D%25252
7%2525253Cform%25252520action%2525253D%25252522http%2525253A//
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25252522....%25252522%25252520method%2525253D%25252522post%25
252522%2525253E%25252520%2525250A%2525253Cp%2525253ETu%25
252520nombre%2525253A%25252520%2525250A%2525253Cinput%252525
20type%2525253D%25252522text%25252522%25252520name%2525253D
%25252522tu_nombre%25252522%2525253E%2525253C/p%2525253E%25
25250A%2525253Cp%2525253ETu%25252520email%2525253A%25252520
%2525250A%2525253Cinput%25252520type%2525253D%25252522text%25
252522%25252520name%2525253D%25252522tu_email%25252522%25252
53E%2525253C/p%2525253E%25252520%2525250A%2525253Cp%2525253
ENombre%25252520de%25252520tu%25252520amigo%2525253A%2525252
0%2525250A%2525253Cinput%25252520type%2525253D%25252522text%
25252522%25252520name%2525253D%25252522nombre_amigo%25252522%
2525253E%2525253C/p%2525253E%25252520%2525250A%2525253Cp%252
5253EE-mail%25252520de%25252520tu%25252520amigo%2525253A%2525
2520%2525250A%2525253Cinput%25252520type%2525253D%25252522text
%25252522%25252520name%2525253D%25252522email_amigo%25252522%
2525253E%2525253C/p%2525253E%25252520%2525250A%2525253Cimg%2
5252520src%2525253D%25252522imagen.jpg%25252522%2525253E%25252
520%2525250A%2525253Cinput%25252520type%2525253D%25252522submi
t%25252522%25252520value%2525253D%25252522Enviar%25252522%252
5253E%25252520%2525250A%2525253Cinput%25252520type%2525253D%2
5252522reset%25252522%25252520value%2525253D%25252522Borrar%252
52522%2525253E%25252520%2525250A%2525253C/form%2525253E%25252
7%25253Bd%25253Dunescape%252528m%252529%25253Bdocument.write%
252528d%252529%25253B%25253C/script%25253E%2522%2529%2529%25
3B%250A//--%253E%250A%253C/script%253E%22%0A%0Afunction%20dec
odifica%28%20codigo%20%29%20%7B%0A%09return%20unescape%28codig
o%29%0A%7D%0A%0Awindow.document.open%28%29%0Awindow.documen
t.write%28%20decodifica%28pagina%29%20%29%0Awindow.document.clos
e%28%29%0A%0A//--%3E%0A%3C/script%3E%0A%3C/head%3E%0A%3Cbo
dy%3E%0A%3C/body%3E%0A%3C/html%3E"));
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</script>