package org.apache.commons.httpclient does not exist

Hello there
I just tried to test YahooWebServiceGet.java and YahooWebServiceParseResults.java in netbeans. To do so I included all the jar files from httpcomponents-client-4.0.1/lib/ in the netbeans project classpath. As far as it seems, this jar files do not include package org.apache.commons.httpclient because to start with I am getting errors at these sentences:

import org.apache.commons.httpclient.;
import org.apache.commons.httpclient.methods.;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;

Does anyone know what must be done to compile and test this classes YahooWebServiceGet.java and YahooWebServiceParseResults.java successfully?

Thanks in advance