diff -r 488665d49417 -r 57ce13805b6f includes/clientside/tinymce/themes/simple/skins/o2k7/ui.css
--- a/includes/clientside/tinymce/themes/simple/skins/o2k7/ui.css	Sun Dec 21 15:35:46 2008 -0500
+++ b/includes/clientside/tinymce/themes/simple/skins/o2k7/ui.css	Sun Dec 21 16:28:00 2008 -0500
@@ -18,7 +18,7 @@
 .o2k7SimpleSkin a.mceButton span, .o2k7SimpleSkin a.mceButton img {margin:1px 0 0 1px}
 .o2k7SimpleSkin a.mceButtonEnabled:hover {background-color:#B2BBD0; background-position:0 -22px}
 .o2k7SimpleSkin a.mceButtonActive {background-position:0 -44px}
-.o2k7SimpleSkin .mceButtonDisabled span {opacity:0.3; filter:alpha(opacity=30)}
+.o2k7SimpleSkin .mceButtonDisabled span {opacity:0.3; -ms-filter:'alpha(opacity=30)'; filter:alpha(opacity=30)}
 
 /* Separator */
 .o2k7SimpleSkin .mceSeparator {display:block; background:url(img/button_bg.png) -22px 0; width:5px; height:22px}