Code refactoring for common skin

[Sean.McClowry]

Nothing major planned at this stage, but a few items on initial review:

• Better commenting of code needed within the framework
  
• Some minor refactoring and commenting should be done to more clearly show the separation of responsibilities with main.css and common.css
  
• There are places where variables could be set as opposed to continually giving the full path name, e.g. common.css should have an images dir variable to simplify changing path names for images directory
  

Refer to here: http://mike2.openmethodology.org/wiki/OmCollab_common_skin_framework

This would be minor updates and should only be done as results of work as output from the navigation review

[Sean.McClowry]

Should implement as part of ticket 69