tuupola/jquery_lazyload — pull request #18 by ChrisYip (2012-01-17 06:30:03+00:00)
Title: Fix always scroll to top issue on IE 7

When the container is "window" and event is "scroll", will cause window to scroll back to top on IE 7.

The reason is

```javascript
// settings.container = window
// settings.event = "scroll"
$(settings.container).trigger(settings.event);
```

works as the below code on IE 7:

``window.scrollTo(0, 0);```

Also, I cached window object to improve performance.