Here is a tab of the main riff, ive been dissapointed not seing this existing on
the internet so i decided to make it so. This is just the main riff, and real
easy and fun to jam on :D
    A                 G      G              G
|--------------------------------------------------|
|---10--10-10-x-x-x-x-8-8-8---------x-x-x-x-8-8-8--|
|---9---9--9--x-x-x-x-7-7-7--7--7-7-x-x-x-x-7-7-7--|
|---11--11-11-x-x-x-x-9-9-9--7--7-7-x-x-x-x-9-9-9--|
|-------------x-x-x-x--------9--9-9-x-x-x-x--------|
|--------------------------------------------------|

you can have some fun with this riff, like on the lower G note, 
  G
|---------|
|---------|
|-------7-|
|-----7-7-|
|-7h9---9-|
|---------|



it was played like this mostly in the late 70s, mid 80s and 95, but any other
time they played it just a little different, like this(rapidly).
   A                 G    G              G
|---------------------------------------------|
|--10-xx-10-xx-10-xx-8-8----xx---xx---xx-8-8--|
|--9--xx-9--xx-9--xx-7-7--7-xx-7-xx-7-xx-7-7--|
|--11-xx-11-xx-11-xx-9-9--7-xx-7-xx-7-xx-9-9--|
|-----xx----xx----xx------9-xx-9-xx-9-xx------|
|---------------------------------------------|

Thats basically it, this is just by ear, and it sounds right to me.
-Derek

Jerry Lives :-)