PHP FTP or Accessing Other User

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I have a reseller account and have many clients on the same server.  I am wondering if I can access their directories like /home/username/public_html/ someway from another user (/home/otherusername/public_html/.  I have everything running on my server and certain features access the clients sites.  Right now, most of it I am using PHP's FTP functions. 

 

If I can't access directories, how would I go about create a directory listing of images with thumbnails?  I have the directory listing through ftp and can navigate throughout the site, however I am not sure how to show the thumbnails.  I suppose I could get the url and then post it http://www.url.com/path, however the issue with that is that I cannot show password protected images. 

 

Any ideas would be appreciated.  Thanks!

 

-JC