NSFileManager *fm=[NSFileManager defaultManager];
     
    NSString *pathToFile=[NSString stringWithFormat:@"%@/sells", [fm currentDirectoryPath]];
    if ([fm fileExistsAtPath:pathToFile] == NO)
    {
        return NO;
    }
    else
    {
        if(content)
        {
            [content release];  
        }
        content=[[NSMutableString alloc] initWithContentsOfFile:pathToFile encoding:NSUTF8StringEncoding error:nil];
    }
    return YES;