if (document.images) {
  preload_image = new Image(); 
      
  // set image url
  image_url = new Array();
//  image_url[0] = "../../../site/home/sidemenu11-bioinformatics.jpg";
//  image_url[1] = "../../../site/home/sidemenu12-medicine.jpg";
//  image_url[2] = "../../../site/home/sidemenu13-id.jpg";
//  image_url[3] = "../../../site/home/sidemenu14-jtc.jpg";
//  image_url[4] = "../../../site/home/sidemenu15-env.jpg";
//  image_url[5] = "../../../site/home/sidemenu16-plant.jpg";
//  image_url[6] = "../../../site/home/sidemenu17-synthetic.jpg";
//  image_url[7] = "../../../site/home/sidemenu18-policy.jpg";
//  image_url[8] = "../../../site/home/sidemenu22-education.jpg";

  for(var i = 0; i < image_url.length; i++) 
    preload_image.src = image_url[i];
} // end if (document.images)