Using an index field

[David Squance]

I've built a help stack for an app which consists mostly of two fields, 
one the content and the other an index.  Clicking on a line in the 
index takes the user to the appropriate section of the help contents.  
It works fine when going 'down' the contents, but I'm wondering if 
there is a simple way for the user to avoid having to click twice to 
access any section which occurs earlier in the content than where the 
last found line occurs.
Thanks, Dave