[ticket/218] Fix undefined background-position in IE 8/9

This will only take care of the errors that show in IE 8/9. The clock
still doesn't properly show in at least IE8.

B3P-218
[ticket/218] Correctly animate clock in IE8

This should make sure that the correct background positions are used for
animating the clock in IE8.

B3P-218
[ticket/218] Apply changes to prosilver portal_clock.js to subsilver2

B3P-218
[ticket/218] Make sure clock doesn't cause trembling blocks in left column

B3P-218
[ticket/218] Add missing fix for IE8 in subsilver2

B3P-218
Merge pull request #222 from marc1706/ticket/218

[ticket/218] Fix undefined background-position in IE 8/9