Please explain this to me

[WirelessWave]

As far as I know the MM stands for Macromedia, that is a script generated by Dreamweaver I think for roll-over button effects...
I might be wrong....

EDIT:
I've reasearched a bit and, yes it's a dreamweaver code..

You use it this way...

Code:

<img src="images/square.png" alt="" name="motion3" width="19" height="19" border="0" id="motion3"
onMouseOver="MM_swapImage('motionbox','','images/Test1.jpg','motion3','','images/white.png',1)"
onMouseOut="MM_swapImgRestore()"/>

Found at.. http://forums.digitalpoint.com/showthread.php?t=340315

second edit:
Here I've written a tutorial on how to create button mouse over effects if you're looking to do this...
http://www.supportforums.net/showthread.php?tid=1146

Yes, it does look like that, It seems like i am starting to no alot about dreamweiver