Transitions: putting back the code back that was accidently removed b…

…y commit 8e570e3.

js/jquery.mobile.transition.js

@@ -74,7 +74,10 @@ var createHandler = function( sequential ){
 
 			startIn = function(){	
 
-				$to.addClass( $.mobile.activePageClass );				
+				//prevent flickering in phonegap container
+				$to.css("z-index", -10);
+
+				$to.addClass( $.mobile.activePageClass + toPreClass );			
 
 				// Send focus to page as it is now display: block
 				$.mobile.focusPage( $to );
@@ -83,12 +86,17 @@ var createHandler = function( sequential ){
 				$to.height( screenHeight + toScroll );
 
 				scrollPage();
+
+				//restores visibility of the new page
+				$to.css("z-index", "");
 
 				if( !none ){
 					$to.animationComplete( doneIn );
 				}
 
-				$to.addClass( name + " in" + reverseClass );
+				$to
+					.removeClass( toPreClass )
+					.addClass( name + " in" + reverseClass );
 
 				if( none ){
 					doneIn();