Question: I'm designing a dynamic web page that loads contents by AJAX, like the wall of facebook, first to the top last to the bottom. However, i don't want to change the scrolled content. For example, when new contents are loaded page is driven down, but i want a script to fix scrolled content on screen. How can I do this? Help me please. 

**Update**

Okey, I've found the key function it is scrollBy(x,y); function of the window object. however now i want to use it with jquery animation how can i animate this function?

Answer: 
Maybe the answer to "when would \* fail to match" is "never".
Since `*` will always accept the empty string, it will only fail if you have something before or after it that doesn't match. For example, `ab*c` will fail to match `azc`, since `b*` will not match `z` and `c` will not match `zc`.