Intellimouse vs intellimouse explorer?

[Sea Walnut]

I'm about the make the leap from ball to optical and I wanted to know exactly what the differences were between the microsoft intellimouse explorer and the microsoft intellimouse.
Just to make sure, here's a pic of the intellimouse:
<IMG SRC="http://www.terraworld.net/jjoseph/intellimouse.jpg" border=0>

And here's a pic of the intellimouse EXPLORER:
<IMG SRC="http://members.aol.com/kr5526/explorer" border=0>

Thanks.
-Sea Walnut

[Sea Walnut]

sorry- I accidentally posted two threads. Please post in my other thread (it's in this same forum), and if a mod comes by, please close this thread. Sorry.
-Sea walnut