Loading custom TableView cell asynchronously

Question

hey all.i have custom cell which has a label and an image in it..i load the images synchronously the tableView but when i scroll down it frozen..so i want to load it asynchronously..to do that i read some tutorials and i found that site http://www.markj.net/iphone-asynchronous-table-image/ and import that files into my project but i cant use it..i wrote like that
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
          static NSString *CellIdentifier = @"Cell";
          Cell *cell =(Cell*) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
          if (cell == nil)
                    [[NSBundle mainBundle] loadNibNamed:@"Cell" owner:self options:nil];
                    cell=satir;
  else
  asyncImageview* oldImage = (asyncImageview*)
                    [cell.contentView viewWithTag:999];
                    [oldImage removeFromSuperview];
          CGRect frame;
          frame.size.width=75;
          frame.size.height=75;
          frame.origin.x=0;
          frame.origin.y=0;
          asyncImageview* asyncImage = [[[asyncImageview alloc] initWithFrame:frame] autorelease];
          NSURL* url = [thumb objectAtIndex:indexPath.row];
          [asyncImage loadImageFromURL:url];
  NSLog(@"url : %@",url);
          [cell.contentView addSubview:asyncImage];
    return cell;
but i se nothing here..what is wrong there or what can  do to load images asynchronously

Answer 1

thanks for the reply..i tried like in that example before..my app is like that
@interface FirstViewController : UIViewController
when i change it like UITableViewController the application crashed suddenly..why is that ?