Fixed the security hole (really, I'm a moron - used $failed > $threshold instead of $failed >= $threashold) and patched up some...erm... math issues
// UK lang variables
tinyMCE.addToLang('',{
insert_advhr_desc : 'Horizontale rule',
insert_advhr_width : 'Width',
insert_advhr_size : 'Height',
insert_advhr_noshade : 'No shadow'
});