Other - Accessible news scroller

Hi All,

I need a javascript for news ticker. i googled a lot but i could not find which i want, here is the requirement.
I have the following xhtml elements
<ul>
<li><a href="#" >test1</li>
<li><a href="#" >test2</li>
<li><a href="#" >test3</li>
<li><a href="#" >test4</li>
</ul>

this xhtml should show in a particular area with scrolling the li like this sequence
_______________
| test1
| test2 |
| |
|_______________|

_______________
| test2 |
| test3 |
| |
|_______________|
_______________
| test3 |
| test4 |
| |
|_______________|
_______________
| test4 |
| test1 |
| |
|_______________|

Scrolling should be continus and section will stop and show for 4 seconds....scolling will fas. there should be no gap between the end and start position

likes this
test1
test2
.....pause 4 seconds and show

test2
test3

.....pause 4 seconds and show

test3
test4

.....pause 4 seconds and show

test4
test5

.....pause 4 seconds and so on.......

and add the mouseover to stop the message and mouseout to continue....

i dont want to write any document.write to html. it just grap the li content and display like above.


Any experts..... Please help me