HTML - Directories In Htdocs

Hi guys,

quick question, because i actually don't know the answer to it:
if i have directories (i.e. Pictures) in my htdocs while the *.php/html extensions are in the root folder, i noticed that when an image link is pressed to open a picture in a new window, the address bar displays the directory name. Is this normal in a regular website, or is there a code for me to hide the address location when a new window is opened to display the picture?

thanks