How to get Hibernate + javax.persistence via Maven2 pom.xml

I am a newbie with Maven2 and I write a pom.xml. Now I want to get Hibernate and javax.persistence to resolve this:

import javax.persistence.Entity;
...
import org.hibernate.annotations.Fetch;
...

What needed to be done? I wrote in my pom.xml:

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate</artifactId>
    <version>3.5.6-Final</version>
</dependency>

But I get an error (I already get some other dependencies, but Hibernate does not work):

11.10.10 13:19:53 MESZ: Refreshing [/testProject/pom.xml]
11.10.10 13:19:54 MESZ: Missing artifact org.hibernate:hibernate:jar:3.5.6-Final:compile
11.10.10 13:19:54 MESZ: Maven Builder: AUTO_BUILD 
11.10.10 13:19:55 MESZ: Maven Builder: AUTO_BUILD

So, what's wrong here? Why it does not know the artifact?

Thank you in advance & Best Regards.