New vars added for the new event of shift-clicking to select ranges of
files in the file manager
Get the last file clicked and work out if the file we've just clicked is
alphabetically greater than it or not, so we end up with a startFile <
endFile and are therefore selecting from startFile downwards
In a for loop, run until we find our startFile and begin selecting.
If we're selecting and the file we're looking at isn't in our
selectedFiles array, select that file and add it to the array
Finally, when we reach our endFile, break out of the loop
New global function added called 'get'
This is because top.document.getElementById is used so often, we
actually save 2kb by having a function to return the object, plus it's
much more readable to have:
get('serverMessage').style.opacity = '1';
rather than
document.getElementById('#serverMessage').style.opacity = '1';
newTab now has a z-index of 0 so that it slides behind other tabs when
new tabs are opened
serverMessage is now display: inline-block and hiding and showing is
done on moving the left position to 0 or 2000px to show or hide (doing
the show/hide on changing the display type was causing reflow issues
which seemed to mean occassionally the newTab wasn't moving to the
correct position)
