Background image scroll issue with two cellview in UITableViewController

Question

self.tableView.backgroundColor = [[[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"evt_det_bg.png"]]autorelease];

I want this background view will be scrollable.

I tried the above code.But the background applied each row.I am using two cellview for the tableView.How can i achieve this.

Thanks