Added support for preloading javascript libs ($template->preload_js()). Updated admin theme and Tigra Tree Menu to support this + JS_{HEADER,FOOTER} variables.
.mcePageBreak {display:block;border:0;width:100%;height:12px;border-top:1px dotted #ccc;margin-top:15px;background:#fff url(../img/pagebreak.gif) no-repeat center top;}