the main reason for writing this tut is that when i came to AO no one gave me a clue on how to hack or how to deface.this tut is strictly for newbies and i would suggest others(not invited once) to skip to the last para .
lets start -
well this is the easiest way of defacing a site that i know on win98 machine go to my computer->web folder->add new whatever in the dialogue box give away domain name like(http://my.com)press enter and u are done if u see dire structure in the web folder then you have got it go there upload ur pages or whatever.
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if u don't see the dir structure what to do i dunno!!!most probably in this case u can't upload ur files or anything.if someone knows what to do in this case he/she is most welcome to add his/her opinion here.

this is the mathod through mitnich's company website got defaced link -
http://zone-h.org/en/news/read/id=2353
this link tells u how it got defaced.

i know most of u won't like it but i have to do it because i believe helping others and i think i helped most of the newbies out there.Also watch out for part 2 it is gonna be one step ahead of this one.