i am using maven for the very first time . I am using with eclipse to create a project . After creating a project it shows me following errors in problem window . I don't know what to do . please help me out

The errors are as follow:

4/27/10 12:24:44 PM IST:Missing artifact org.richfaces.ui:richfaces-ui:jar:3.3.3-SNAPSHOT:compile
4/27/10 12:24:44 PM IST: Missing artifact org.richfaces.framework:richfaces-impl:jar:3.3.3-SNAPSHOT:provided
4/27/10 12:24:44 PM IST: Missing artifact javax.faces:jsf-api:jar:1.2_12:compile
4/27/10 12:24:45 PM IST: Missing artifact javax.faces:jsf-impl:jar:1.2_12:compile
4/27/10 12:24:45 PM IST: Missing artifact el-impl:el-impl:jar:1.0:provided
4/27/10 12:24:45 PM IST: Missing artifact org.richfaces.framework:richfaces-api:jar:3.3.3-SNAPSHOT:compile
4/27/10 12:24:45 PM IST: Missing artifact org.richfaces.framework:richfaces-impl:jar:3.3.3-SNAPSHOT:compile