modify host file with autoit

have some servers that i need to modify the host file on if they can't resolve. would like to do it with autoit
Basically i want to check to see if say "myserver.domain.com" is pinging and if it isn't then change/add entry to host file to the correct ip address.

So if its currently 12.12.12.1   i want to search the host file and comment out the line for 12.12.12.1 if it exist and change it to 10.10.10.1 (obviously the ips are examples).

i have this so far but not sure how to parse the host file and change existing entries. thanks!

changehost()

Func changehost()
    ; Ping myserver.domain.com with a timeout of 250ms.
    Local $iPing = Ping("myserver.domain.com", 250)
    Local $ipaddress = TCPNameToIP("myserver.domain.com")
	$Server = "myserver.domain.com"
    If $iPing Then ; If a value greater than 0 then all is good..

	 Else ; we need to change the host entry
		 if $ipaddress = "12.12.12.1" Then
			$OPENHOSTS = FileOpen("C:\WINDOWS\system32\drivers\etc\hosts", 1)
			FileWrite($OPENHOSTS, "10.10.10.1" & @TAB & $Server & @CRLF)
			FileClose($OPENHOSTS)
			; write to host file 10.10.10.1 and remove entry with 12.12.12.1 this is where i'm confused on how to do that
		 Else
			$OPENHOSTS = FileOpen("C:\WINDOWS\system32\drivers\etc\hosts", 1)
			FileWrite($OPENHOSTS, "12.12.12.1" & @TAB & $Server & @CRLF)
			FileClose($OPENHOSTS)
			;write to the host file 12.12.12.1 and remove 10.10.10.1 entry
		 EndIf
        
    EndIf
 EndFunc   ;==>changehost

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