if (document.images) {
  imageTOPon = new Image();
  imageTOPon.src ="/conference/ltd11/.include/button/top_on.png";
  imageTOPoff = new Image();
  imageTOPoff.src ="/conference/ltd11/.include/button/top_off.png";

  imageREGISTRATIONon = new Image();
  imageREGISTRATIONon.src ="/conference/ltd11/.include/button/registration_on.png";
  imageREGISTRATIONoff = new Image();
  imageREGISTRATIONoff.src ="/conference/ltd11/.include/button/registration_off.png";

  imageABSTRACTon = new Image();
  imageABSTRACTon.src ="/conference/ltd11/.include/button/abst_on.png";
  imageABSTRACToff = new Image();
  imageABSTRACToff.src ="/conference/ltd11/.include/button/abst_off.png";

  imageTOPICSon = new Image();
  imageTOPICSon.src ="/conference/ltd11/.include/button/topics_on.png";
  imageTOPICSoff = new Image();
  imageTOPICSoff.src ="/conference/ltd11/.include/button/topics_off.png";

  imageVENUEon = new Image();
  imageVENUEon.src ="/conference/ltd11/.include/button/venue_on.png";
  imageVENUEoff = new Image();
  imageVENUEoff.src ="/conference/ltd11/.include/button/venue_off.png";

  imagePROGRAMon = new Image();
  imagePROGRAMon.src ="/conference/ltd11/.include/button/program_on.png";
  imagePROGRAMoff = new Image();
  imagePROGRAMoff.src ="/conference/ltd11/.include/button/program_off.png";

  imageSUPPORTon = new Image();
  imageSUPPORTon.src ="/conference/ltd11/.include/button/support_on.png";
  imageSUPPORToff = new Image();
  imageSUPPORToff.src ="/conference/ltd11/.include/button/support_off.png";

  imagePROCon = new Image();
  imagePROCon.src ="/conference/ltd11/.include/button/proc_on.png";
  imagePROCoff = new Image();
  imagePROCoff.src ="/conference/ltd11/.include/button/proc_off.png";

  imageTRAVELon = new Image();
  imageTRAVELon.src ="/conference/ltd11/.include/button/travel_on.png";
  imageTRAVELoff = new Image();
  imageTRAVELoff.src ="/conference/ltd11/.include/button/travel_off.png";

  imageACCOMMon = new Image();
  imageACCOMMon.src ="/conference/ltd11/.include/button/accomm_on.png";
  imageACCOMMoff = new Image();
  imageACCOMMoff.src ="/conference/ltd11/.include/button/accomm_off.png";

  imageSCHEDon = new Image();
  imageSCHEDon.src ="/conference/ltd11/.include/button/schedule_on.png";
  imageSCHEDoff = new Image();
  imageSCHEDoff.src ="/conference/ltd11/.include/button/schedule_off.png";

  imageVISAon = new Image();
  imageVISAon.src ="/conference/ltd11/.include/button/visa_on.png";
  imageVISAoff = new Image();
  imageVISAoff.src ="/conference/ltd11/.include/button/visa_off.png";

  imageSATELLITESon = new Image();
  imageSATELLITESon.src ="/conference/ltd11/.include/button/related_conf_on.png";
  imageSATELLITESoff = new Image();
  imageSATELLITESoff.src ="/conference/ltd11/.include/button/related_conf_off.png";

  imageEXHIBITon = new Image();
  imageEXHIBITon.src ="/conference/ltd11/.include/button/exhibitors_on.png";
  imageEXHIBIToff = new Image();
  imageEXHIBIToff.src ="/conference/ltd11/.include/button/exhibitors_off.png";

  imageCOMMon = new Image();
  imageCOMMon.src ="/conference/ltd11/.include/button/committee_on.png";
  imageCOMMoff = new Image();
  imageCOMMoff.src ="/conference/ltd11/.include/button/committee_off.png";

  imageOTHERon = new Image();
  imageOTHERon.src ="/conference/ltd11/.include/button/other_on.png";
  imageOTHERoff = new Image();
  imageOTHERoff.src ="/conference/ltd11/.include/button/other_off.png";
}

function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "on.src");
  }
}

function turnOff(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "off.src");
  }
}