// 画像の先読込
preImg = new Image();
preImg.src = "../images/pi_recorders_o.gif";
preImg.src = "../images/pi_controllers_o.gif";
preImg.src = "../images/pi_sensors_o.gif";
preImg.src = "../images/pi_loggers_o.gif";
preImg.src = "../images/pi_thermometers_o.gif";
preImg.src = "../images/pi_thermovisions_o.gif";
preImg.src = "../images/pi_meters_o.gif";
preImg.src = "../images/pi_regulators_o.gif";
preImg.src = "../images/pi_systems_o.gif";
preImg.src = "../images/pi_traceability_o.gif";

// ロールオーバー
if (document.images) {
   pi_recorders = new Image(); pi_recorders = "../images/pi_recorders_o.gif";
   pi_controllers = new Image(); pi_controllers = "../images/pi_controllers_o.gif";
   pi_sensors = new Image(); pi_sensors = "../images/pi_sensors_o.gif";
   pi_loggers = new Image(); pi_loggers = "../images/pi_loggers_o.gif";
   pi_thermometers = new Image(); pi_thermometers = "../images/pi_thermometers_o.gif";
   pi_thermovisions = new Image(); pi_thermovisions = "../images/pi_thermovisions_o.gif";
   pi_meters = new Image(); pi_meters = "../images/pi_meters_o.gif";
   pi_regulators = new Image(); pi_regulators = "../images/pi_regulators_o.gif";
   pi_systems = new Image(); pi_systems = "../images/pi_systems_o.gif";
   pi_list = new Image(); pi_list = "../images/pi_list_o.gif";
}
function setImage(img, image) {
   if (img) {
      img.src = image;
   }
}