Adding paths for image upload

One thing I am trying to do is add an alternative path for the image upload.
I have a admin section which is under
www.thesite.com.au/Admin/
this is where the file is for the upload,
HOWEVER
I want the image to upload to: www.thesite.com.au/images/

I have tried to use …/images/
but this is not working and throws a path error
Is there a way of doing this ??