- (void) turnActivityViewOn: (UIView *) currentView {
	CGRect screenRect = [[UIScreen mainScreen] bounds];
	#define kActivityIndicatorSize 80
	CGRect activityFrame = CGRectMake((screenRect.size.width/2.0) - (kActivityIndicatorSize/2.0),screenRect.size.height/2.0,kActivityIndicatorSize, kActivityIndicatorSize);
	self.activityView = [[UIActivityIndicatorView alloc] initWithFrame:activityFrame];
	self.activityView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
	[window insertSubview: activityView aboveSubview: currentView];
	[activityView release];
	[activityView startAnimating];		
}

- (void) terminateActivityView {
	if (self.activityView == null) 
		return;
	[activityView stopAnimating];
	[activityView removeFromSuperview];
	self.activityView = null;
}

turnActivityOn
	ObjectiveCBridge performSelectorOnMainThreadDoNotWait: 
		[self sharedApplication delegate turnActivityViewOn: self keyPadController view ].

turnActivityOff
	ObjectiveCBridge performSelectorOnMainThreadDoNotWait: 
		[self sharedApplication delegate terminateActivityView].