text direction hack in the middle of posts?

[Bashar]

in a forum i noticed some users write in a language which is the default language of the forum, and if they want to write in different language which has different direction they such as this http://www.nameclub.com/forum2/thread1235.html they write in arabic its RTL, if someone uses the English post it will be LTR

in phpbb there is a hack where if you write arabic the forum automatically makes that text RTL in the same post and if its english it keeps it LTR (default) sample at http://ubuntume.com/forums/ftopic229.php, phpbb hack as follow (originally from http://forum.oujdacity.net/support-i...rum-t2541.html the page in fresh you can find an english translation at this url)

##############################################################  
## MOD Title: arabic AutoDIR   
## Author : Alaa-eddine KADDOURI 
## Web site : http://www.oujdacity.net 
##############################################################  
#  
#-----[ OPEN ]------------------------------------------  
# 
viewtopic.php 
 
#  
#-----[ FIND ]------------------------------------------  
# 
$row_color = ( !($i % 2) ) ? $theme['td_color1'] : $theme['td_color2']; 
$row_class = ( !($i % 2) ) ? $theme['td_class1'] : $theme['td_class2']; 
 
#  
#-----[ ADD AFTER ]------------------------------------------  
# 
 
$coef = 2;  
$message = str_replace("<br />", "&nbsp;<br />", $message); 
$parts = explode("<br />", $message); 
$cc = count($parts); 
 
$message = "";   
 
for ($ii = 0; $ii < $cc; $ii++) 
{ 
        $text = strip_tags($parts[$ii]); 
        $cleanText = ereg_replace ("[a-zA-Z]", "", $text); 
 
        if (strlen($cleanText)*$coef < strlen($text)) 
              $align="direction:ltr;"; 
        else  
              $align="direction:rtl;"; 
        
        $message .= "<div style=\"$align\">".$parts[$ii]."</div>"; 
} 
#  
#-----[ SAVE/CLOSE ALL FILES ]------------------------------------------  
# 
##############################################################  
# 
# EoM

and

/////////////////////////////////////////////////// 
// Auteur : Alaa-eddine KADDOURI 
// 
// Extrait de oujdacity_functions.php 
// 
// 
function isLatin($str, $coef) 
{   
  $rg = ereg_replace ("[A-Za-z]", "", $str); 
  if (strlen($rg)*$coef < strlen($str)) return true; 
  return false; 
}

how do you think we can do the above on vbulletin ?

Thank you.