Runtime CSS IE, Swapping

* Fixed big issue in IE: CSS in IE8 + 9 is only capable to handle 4095
selectors max per css sheet. As we use more than 4095 selectors (we used
approx. 5000 selectors), some css selectors didn't apply. Handled by
chunking the CSS elements. Current implementation allows 4x
* Fixed bug  in swapping of elements; containerpostid was not set
correctly