UITableView reuseIdentifier

Question

i m new to iPhone corner... hii.....i am adding a new cell when in editing mode.. and using reuseCell Identifier but when i am inserting a new row the last row contect overlap the new row added content.. plz tell me what's the prob

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

 NSString *MYIdentifier =@"MyIdentifier";

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MYIdentifier];

 if(cell==nil)
 {
  //cell=[[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MYIdentifier] autorelease];
  cell = [self reuseTableViewCellWithIdentifier:MYIdentifier indexPath:indexPath];
 }


 if(indexPath.row == [appDelegate.frndArray count])
 {

 NSString *addNewFrndIndentifier = @"New Friend Indentifier";

 UITableViewCell *frndCell = [tableView dequeueReusableCellWithIdentifier:addNewFrndIndentifier];

 if(frndCell == nil)
   {
  frndCell=[[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MYIdentifier] autorelease];
     }
   [[frndCell textLabel]setText:@"Add new friend"]; 
 }
 return cell; }

-(UITableViewCell *)reuseTableViewCellWithIdentifier:(NSString *)identifier indexPath:(NSIndexPath *)indexPath{

/// some code to display the content added some UIImage and UILabel
return cell
}