http/ftp transform, need help!

[persa]

I need help to debug this script..
I can't tell whats wrong... might the patterns iam using for reg.exp..
The one thing I do know, is that it doesnt transform the "http"/"ftp" words to text/img link in my string.. anyone??

function Check_if_Image($matches) { 
$suffix = strtolower(substr($matches[0],-4)); 
if ( $suffix == '.jpg' or $suffix == '.gif') { 
   $dsn = 'http'.$matches[3].'://'.$matches[4].$matches[5]; 
   if (list($width, $height, $type, $attr) = getimagesize("$dsn")) { 
   if ( ($width > 600) ) { 
       $koef = $width / 600; 
       $width = 600; 
       $height /= $koef; 
       } 
   if ( ($height > 400) ) { 
       $koef = $height / 400; 
       $height = 400; 
       $width /= $koef; 
       } 
   } 
   else { 
       $height=400; 
       $width=600; 
   } 

   $ret = "<img src=\"$dsn\""; 
   $ret .= "\" border=0 width=\"$width\" height=\"$height\">"; 
   } 
else { 
   $ret = '<a href="http'.$matches[3].'://'.$matches[4].$matches[5]; 
   $ret .='" target="_blank">'.$matches[0].'</a>'; 
   } 
return ("$ret"); 
} 

$pattern_html = "/((http|ftp)+(s)?:\/\/[^<>\s]+)/i"; 
$text = preg_replace_callback($pattern_html,'Check_if_Image',$text);