When you make a LINK to a file in a different directory you need to :-
To refer to a file and drill down to a lower directory use
DirectoryName/FileName
To refer to a file in a higher directory use
../FileName
Examples :-
In, for example, a directory chain of
C:/MyDirectory/Coursework/MainHTML/Images/MoreImages
Lets say all your main HTML files are in C:MyDirectory/Coursework/MainHTML
When you want to refer to images stored in MoreImages you would need, for example...
<img src="Images/MoreImages/image.jpg" >
When you want to refer to images stored in CourseWork you would need, for example...
<img src="../image.jpg" >
When you want to link to a .html file stored in MyDirectory you would need, for example...
<a href="../../index.html">Back to file</a>