Why this page keeps loading?

[eluser]behnampmdg3[/eluser]
[quote author="PhilTem" date="1358019887"]1) Directories should always contain a trailing slash =>

Code:

$directory_url = "/home/nickdavi/public_html/upload/server/php/files/thumbnail/";

2) I don't have any other idea expect that you maybe have thousands of files in that directory and it takes some time echoing the links/images [/quote]Hello; I added the slash but it didn't work.
/home/nickdavi/public_html/sincity/website_admin/upload/server/php/files/thumbnail/

There are about 15 files in the folder.