fixing bug 118504 - Stop button always shows disabled image. r=racham sr=hewitt

themes/classic/messenger/primaryToolbar.css

@@ -208,7 +208,7 @@
   -moz-image-region: rect(21px 66px 41px 44px);
 }
 
-#button-stop[disabled] {
+#button-stop[disabled="true"] {
   -moz-image-region: rect(21px 88px 41px 66px) !important;
 }
 

themes/modern/messenger/primaryToolbar.css

@@ -228,7 +228,7 @@
   -moz-image-region: rect(68px 149px 101px 100px);
 }
 
-#button-stop[disabled] {
+#button-stop[disabled="true"] {
   -moz-image-region: rect(68px 199px 101px 150px) !important;
 }