1st : problem with the target page
Index of the old hosting : <form action=/signup.php method=post name=nu>
Index of the new : <form action= method=post name=nu>
PHP version / config may be different, so enable full error reporting in your scripts to see what happens
Some clues : register_globals, magic_quotes...
2nd : (remark) you don't respect W3C rules
for example you must write parameters between quotes (<form action="/signup.php" method="post" name="nu">), use external stylesheets instead of embedded code & deprecated elements, use "table" only to display data arrays...
Better rendering into browsers, code more clean...
Tell me if you need more help
Good luck