ive worked with images & mysql by uploading the file to (DIR)/upload then storing the directory only in mysql.

then using something like :-
<?php
$result=mysql_query("select * images where id =...

ORIGINAL
<?php
session_start();

if(!isset($_SESSION['captcha'])){session_register('captcha');}
$PHP_SELF = $_SERVER['PHP_SELF'];
$stringa = '';
$cifre = 5;
for($i=1;$i<=$cifre;$i++){...

unexpected generaly means youve missed a '}' somwhere and php parser has reached the end of the script expecting it get used to error checking
1) get a decent text editor i use textpad which is so...