fire event with selenium rc

Hi Guys i am trying to click on a button from a pop up window but my selenium code does not find the element could you please help this is my code:
se.click( "//div[@id='s_content-innerContainer']//span[contains(text(), 'Save and Continue »')]",
                      shortTimeout );
            se.fireEvent( "//div[@id='s_content-innerContainer']//span[contains(text(), 'Save and Continue »')]",
                          "click" );
            se.waitForPageToLoad( pageLoadTimeout );
            waithForAjax();
            // here after waiting a little a new pop up window will appear which i am trying to click on the button from it
            //Click on the Yes button from the new pop up window
            se.click( "//div[@id='saveSurveyLastnameError']//a[@class='saveSurvey s_button']/span[contains(text(),'Yes')]",
                      shortTimeout );
            se.waitForPageToLoad( pageLoadTimeout );
           
Please help !