installed Oracle8.1.7 on RedHat7.0

[SUN‏]

I installed Oracle8.1.7 on RedHat7.0
But I got some problem.
Below is the Error:
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[oracle@tedlinux Disk1]$ ./runInstaller
[oracle@tedlinux Disk1]$ Initializing Java Virtual Machine from
../stage/Compone
nts/oracle.swd.jre/1.1.8/1/DataFiles/Expanded/linux/bin/jre. Please wait...
java.lang.InternalError: Can't connect to X11 window server using
'ted2000.ec.co
m' as the value of the DISPLAY variable.
at sun.awt.motif.MToolkit.<init>(MToolkit.java:63)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:394)
at
oracle.sysman.oii.oiif.oiifm.OiifmSplashScreen.getImage(OiifmSplashSc
reen.java:67)
at
oracle.sysman.oii.oiif.oiifm.OiifmSplashScreen.<init>(OiifmSplashScre
en.java:45)
at oracle.sysman.oii.oiic.OiicInstaller.main(OiicInstaller.java:418)

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How can I reslove this problem?

--
Ted Wu