Well for some reason vertical was working to me but I needed horizontal for my site. It was very strange because sometimes it worked and sometimes it didnt. I tried to copy the code from other's sites with 3.5.1 with not any result. I did some changes and finally made it work. Here is the code:
<!-- / Quick Register Box -->
<thead>
<tr>
<td class="tcat" colspan="6"><div align="center">Quick
Register </div></td>
</tr>
<tr>
<td class="alt1" colspan="6"> <div align="center">
<span class="smallfont"><script type="text/javascript" src="clientscript/vbulletin_md5.js"></script>
<script type="text/javascript">
function verify_passwords(password1, password2)
{
// do various checks, this will save people noticing mistakes on next page
if (password1.value == '' || password2.value == '')
{
alert('Fill out both password fields');
return false;
}
else if (password1.value != password2.value)
{
alert('Entered passwords do not match');
return false;
}
else
{
md5hash(password1, document.forms.register.password_md5);
md5hash(password2, document.forms.register.passwordconfirm_md5);
return true;
}
return false;
}
</script>
<form action="register.php" name="register" method="post" onsubmit="return verify_passwords(password, passwordconfirm);">
<input name="s" value="" type="hidden">
<input name="do" value="addmember" type="hidden">
<input name="url" value="index.php" type="hidden">
<input name="agree" value="" type="hidden">
<input name="password_md5" type="hidden">
<input name="passwordconfirm_md5" type="hidden">
User Name:
<input class="bginput" name="username" maxlength="15" value="" style="width: 70px;" type="text">
Password:
<input class="bginput" name="password" maxlength="15" value="" style="width: 70px;" type="password">
Confirm Password
<input class="bginput" name="passwordconfirm" maxlength="15" value="" style="width: 70px;" type="password">
Email
<input class="bginput" name="email" maxlength="50" value="" style="width: 70px;" type="text">
Confirm Email
<input class="bginput" name="emailconfirm" maxlength="50" value="" style="width: 70px;" type="text">
<br><input name="agree" id="cb_rules_agree" value="1" type="checkbox"><strong>Check to Agree with <a href="register.php?">forum
rules </a></strong><br>
<input class="button" value="Submit" accesskey="s" type="submit">
</form></span>
</div></td>
</tr>
</thead>
</table>
<!-- / Quick Register Box -->