moving a drupal website to another server

Question

I've been working on a drupal website in a server for months but after moving it to another server and url some of the files are not read. for example it seems that it does not read colors.css or all of the image files used in the site.

for more clarification I must add that there is a joomla site on www.example.com then I've put my drupal site on www.example.com/test this is the site which does not work properly.

and before that it had been working on www.something.com/test/test1.

I don't have a clue why it has happend! help