register.php doesn't execute exactly...

hi all,

i've copied my forum/register.php in my root dir ( / ) because i need to do register my user on a page displyed on my homesite.

....but there is a problem... when a submit registration an error occured: "username or email or password hasn't been inserted"
.... i couldn't understand why and so a put an: "echo $username;"
before if sequences but it display nothing, appear empty...

this is my /register.php file... i hope someone help me... this is very important

thanks in advance

[Sh4z0n]

ops sorry i didn't know that's not allowed vb attachments..

... someone may help me please...????