To the last three posters: this method is WAY old and therefore obsolete. It was for the first android version that was shipped with the A855, and the method changed a few times with each new OTA update. The owner of rootyourdroid.info stopped maintaining his site/guides well over a year ago after the method changed once, and in all actuality his guides were full of holes to begin with. The rooting method has now been refined to work on all android versions for the Motorola A855 phone.
I believe super one click (google it, it'll be easy to find) will work if you're looking to try an easy way. The most reliable way is the method by MotoCache1 over a droidforums.net. The only thing is that he stopped maintaining the thread and the link for RSD Lite 4.6 is broken, however I have it in my collection linked in my sig. Thread:
Root Droid 1 - regardless of OS version - Droid Forum - Verizon Droid & the Motorola Droid Forum
good luck