reverse z-index of a and input to make upload work again in ie8/9

apps/files/css/files.css

@@ -28,7 +28,7 @@
 }
 #upload a {
 	position:relative; display:block; width:100%; height:27px;
-	cursor:pointer; z-index:1000;
+	cursor:pointer; z-index:10;
 	background-image:url('%webroot%/core/img/actions/upload.svg');
 	background-repeat:no-repeat;
 	background-position:7px 6px;
@@ -39,7 +39,7 @@
 	left:0; top:0; width:28px; height:27px; padding:0;
 	font-size:1em;
 	-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=0)"; filter:alpha(opacity=0); opacity:0;
-	z-index:-1; position:relative; cursor:pointer; overflow:hidden;
+	z-index:20; position:relative; cursor:pointer; overflow:hidden;
 }
 
 #uploadprogresswrapper { position:absolute; right:13.5em; top:0em; }