hi guys, i just bought my first mac ever, a powerbook 15", been playing around for the last 2 days, kindda get used to it now but there are some little things i can't, someone please help? 1. how to import bookmark from PC? 2. how to hide the file extension? 3. what is the equivelent buttum with "delete" from PC? 4. you can use 'backspace' to go to the previous page in PC, what about mac? 5. what's a good anti virus to use? 6. how to unlock the locked file? how to delete locked file in the trash? 7. this annoys me the most, how do you sort the files in column view? and what is file .sit? i couldnt install my adsl modem driver cause i only can get the driver in .sit file from the modem's website (im using billion 7000) please help, highly appreciate, thanks a lot.