Some Questions about JDBC

hello
i am a beginer in Java.

i want to use your software PostgreSQL to study DateBase.

Now,i hava some mistakes following … when i use "Class.forName( "org.postgresql.Drvier" );" then

D:\temp\ch18\fig18_24>java TableDisplay
Failed to load JDBC/ODBC driver.
java.lang.ClassNotFoundException: org.postgresql.Drvier
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at TableDisplay.<init>(TableDisplay.java:25)
at TableDisplay.main(TableDisplay.java:144)

how can i do ?
write ".;C:\Program Files\PostgreSQL\8.0\jdbc" in the classpath ?
Or where should i put the "postgresql-8.0.309.jdbc3.jar" ?
In the "D:\Java\Java\jdk1.5.0_01\jre\lib\ext" ? or other ways ?