Need some help with an animated navigation bar...

Can anyone point me to a tutorial that would help me achieve this? Or maybe someone has already done something similar that I can use as a guide? Thanks in advance.

http://www.aquaverse.com/estco/vei/vei.gif

They want to do a very basic flash navigation where the arrows follow the nav options, then stop when you click on the link. This will be a glide across the line, not just a rollover effect where the triangle shows up and then disappears. This nav will have three parts to it:

1) the subnav that appears at the top with the lines dividing it -there will be no line with the triangle underneath

2) a third level nav that appears ONLY after you have selected a subnav item. Once these appear, the line will show up with the triangle pointing up

3) a forth level that appears only after you have selected a third
level item. Once these appear, the line will show up with the triangle pointing down and following the items as you roll over them.