Cleans code to complete the pull request from peili, which was committed with a513d6d.

css/videolayout_default.css

 #header{
     display:none;
     position:absolute;
-    height:39px;
+    height: 0px;
     text-align:center;
     top:0;
     left:0;
     right:0;
     z-index:10;
-    height: 0px;
 }
 
 #toolbar {