function preload(imgs){
 for(var i = 0; i < imgs.length; i++){
   var imgObj = new Image();
   imgObj.src = imgs[i];
 }
}
preload(["/img/menu/globalnavi/sub/business.gif","/img/menu/globalnavi/sub/schoolphotos.gif","/img/menu/globalnavi/home.gif","/img/menu/globalnavi/about.gif","/img/menu/globalnavi/sub/welcome.gif","/img/menu/globalnavi/sub/location.gif","/img/menu/globalnavi/sub/program.gif","/img/menu/globalnavi/sub/faq.gif","/img/menu/globalnavi/sub/report.gif","/img/menu/globalnavi/story.gif","/img/menu/globalnavi/how.gif","/img/menu/globalnavi/blog.gif"]);