error: Selenium can not be resolved

I have following selenium RC code
i am using Eclipse
error message: Selenium can not be resolved. Whats wrong in the code?
Please help

package com.example.tests;

import com.thoughtworks.selenium.*;
import org.junit.After;
import org.junit.Before;
import org.junit.*;
import java.util.regex.Pattern;

public class Test {
@Before
public void setUp() throws Exception {
DefaultSelenium selenium = new DefaultSelenium("localhost", 4444, "*chrome", "http://10.0.0.104/hrms_integration/login.php");
selenium.start();
}

@Test
public void test() throws Exception {
selenium.open("/hrms_integration/login.php");
selenium.type("id=txtUserName", "admin");
selenium.type("name=txtPassword", "admin");
selenium.click("name=Submit");
selenium.waitForPageToLoad("30000");
selenium.click("link=Leave");
selenium.waitForPageToLoad("30000");
selenium.selectFrame("rightMenu");
selenium.click("name=allCheck[]");
selenium.type("id=txtEmployee", "testrohan Test");
selenium.click("id=btnSearch");
selenium.waitForPageToLoad("30000");
assertTrue(selenium.isTextPresent("No Records Found"));

}

@After
public void tearDown() throws Exception {
selenium.stop();
}
}

do this in your code public class Test extends SeleneseTestCase

in order to resolve selenium you need to estend your test class with selenese test case...

If you are using test ng then use selenium testng helper jar and extend your class as SeleneseTestNgHelper