Cannot cannot to oracle

hi,
i have successfully installed oracle 11g release 2 in my laptop with centos 5.3.
but after installing i am not able to connect to oracle.
i got following and got these errors:
sqlplus sys as sysdba
enter password:<entered passowrd>
connected to idle instance
SQL>connect scott/tiger@DB11G
ERROR:
ORA-12154:TNS:could not resolve the connect identifier specified
warning :you are no longer connected to oracle
i got these....i am new to oracle in linux.can anyone say how to i start working with oracle 11g in linux.i am really trying to work with oracle 11g in linux for the past 3 months and i am not successful.
someone please explain y i get these errors and how do i solve it....
and also please help me hoe do i retrieve passwords i entered during installing oracle11g in my linux system

hi,
when i entered "startup" i got the following errors:
ORA-01078:failure in processing system parameters
LRM-00109:could not open parameter file '/home/oracle/app/oracle/product/11.2.0/dbhome_1/dbs/initDB11G.ora'
pls help me .....what do i need to do next...
and these are the contents of my tnsnames.ora file:
# tnsnames.ora Network Configuration File: /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.localdomain)
and these are the contents of my sqlnet.ora file
# sqlnet.ora Network Configuration File: /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
ADR_BASE = /home/oracle/app/oracle
please help me solve these issues

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[email protected]
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null

<BLOCKQUOTE>quote:<HR>Originally posted by sarantos:
I had the same problem!What you have to do is to remove this statement from the import of every jsp (in the very first tag).<HR></BLOCKQUOTE>
I tried to do what you propose, it been compiled, but works not properly
null

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