I want to know this to use on another forum. How can I make a picture that says how many posts until a rank up and it changes everytime I post? Can anybody tell me the code?

You can use PHP function imagecreate but I dont recommend you to do that. The problem is if you have many accesses. This kind of "creation on the spot" can ask a lot from your computer... Also, you must have PHP with GD support...

The simplest thing you can do is making a small picture of each numbers from 0 to 9. After that, use something like that (I will assume that the number of post is $nbrPost)

echo "<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\">";
echo "<tr>";
for ($i=0; $i<strlen($nbrPost); $i++){
$number=substr($nbrPost,$i,1);
echo "<td><img border=\"0\" src=\"/images/".$number.".gif\"></td>";
}
echo "</tr>";
echo "</table>";