UIImage *image=[UIImage imageNamed:@"ReturnHome_Dark"];
	UIBarButtonItem* backButton=[[UIBarButtonItem alloc] initWithImage:image landscapeImagePhone:image style:UIBarButtonItemStylePlain target:self action:@selector(doBack:)];
	self.navigationItem.leftBarButtonItem= backButton;

	UIImage* img=[UIImage imageNamed:@"ReturnHome_Dark"];
	UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
	btn.frame =CGRectMake(0, 0, 20, 20);
	[btn setBackgroundImage:img forState:UIControlStateNormal];
	[btn addTarget: self action: @selector(doBack:) forControlEvents: UIControlEventTouchUpInside];
	UIBarButtonItem* item=[[UIBarButtonItem alloc]initWithCustomView:btn];
	self.navigationItem.leftBarButtonItem=item;

	UIButton * btn=[[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 44)];
	[btn addTarget:self action:@selector(doBack:) forControlEvents:UIControlEventTouchUpInside];
	[btn setBackgroundColor:[UIColor clearColor]];
	[self.navigationController.navigationBar addSubview:btn];

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