How to install certificates/keys from IE

[Xavier]

I have a java program that connects to a https site
(https://www.verisign.comg). It throws the following error and
terminates:
ext exception was: java.security.cert.CertificateException: Could not
find the trusted certificate

main, SEND SSL v3.0 ALERT: fatal, description = certificate_unknown

main, WRITE: SSL v3.0 Alert, length = 2

My question is, since I can connect to the site using Internet
Explorer, how can I find the correct certificate and export it from IE
and import into the java key store? I tried exporting several
certificates issued by Verisign and imported into java keystore using
keytool, but nothing works...

Please Help...