Permission denied accessing images in image folder

Gallery version (not just "2"):2.3
PHP version (e.g. 5.1.6):5.2.5
PHPInfo Link (see FAQ):http://pishahang.org/phpinfo.php
Webserver (e.g. Apache 1.3.33):Apache/2.0.63
Database (e.g. MySql 5.0.32):Mysql 5.0.51a
Activated toolkits (e.g. NetPbm, GD):
Operating system (e.g. Linux):Linux
Browser (e.g. Firefox 2.0):Opera 9.63

I installed Gallery2 integrated for my PHP website
I don't have permission to access images in image folder and the logo of the gallery canot be displayed :
The permission of folders and files in image folder are 757

my page:
http://neyshabur.org/new/gallery.php

and I don't have access to this file:
http://neyshabur.org/gallery/images/galleryLogo_sm.gif

What should [i]I do?