I did something dumb  plz help

hello,
i was deleting some folders of my drive and accidently deleted my folder with the x on it. im pretty sure it was the os duh. i realized this after i shut it off. so now when i try to start it up it gives me a question mark and a folder flashing. i hope i didnt empty the trash but i cant remember. is there anything i can do to fix it? any help greatly appreciated.

I don't know for sure if this will work. Boot from your OS X Installer Disc One. After the installer loads select your language and click on the Continue button. When the menu bar appears select the Terminal application from the Utilities menu (I'm pretty sure it's a menu choice.) After the Terminal loads you will see a prompt in the Terminal's window. I'm not sure what it will say, so for the sake of this experiment I'll use prompt> to indicate the prompt in the following. Enter the commands and press return to run the command. You need to know the volume name you have assigned to the computer's hard drive, e.g., Macintosh HD.
prompt>cd /Volumes/volname/Users/username
Substitute your computer's drive name for "volname" and your shortname for "username"
prompt>ls -l .Trash
Should list the contents of your Trashcan. If your system folder is in the trash you should see it listed as System. The listing will look something like this:
drwxr-xr-x 4 root wheel 136 Feb 1 23:43 System
If there is nothing listed in the Trash, then you've deleted the System folder and you can stop here, quit the Terminal, and reinstall OS X. If you do see a listing like the one above then continue:
prompt>mv .Trash/System /Volumes/volname
prompt>ls -l /Volumes/volname
Verify that you now have a System folder listed on the volume. If so, quit Terminal and restart.
If you get any system error message doing the above to the effect you don't have sufficient permissions then insert the command "sudo" in front of each command line listed above, e.g., prompt>sudo ls -l .Trash. You will be asked to authenticate with your admin password that will not be echoed.
I'm pretty sure the above should work. However, I've never had occasion to try it.

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