first you create the view horizontally and then you load that document to this view..then you can able to scroll horizontally....
UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];  
scroll.pagingEnabled = YES;  
NSInteger numberOfViews = 3;  
for (int i = 0; i < numberOfViews; i++) {  
CGFloat yOrigin = i * self.view.frame.size.width;  
UIView *awesomeView = [[UIView alloc] initWithFrame:CGRectMake(yOrigin, 0,   self.view.frame.size.width, self.view.frame.size.height)];  
awesomeView.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5 alpha:1];  
[scroll addSubview:awesomeView];  
[awesomeView release];
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews,   self.view.frame.size.height);  
[self.view addSubview:scroll];  
[for more details][1]
  [1]: http://idevzilla.com/2010/09/16/uiscrollview-a-really-simple-tutorial/