preloadMenu()
function preloadMenu(){
if(document.images){

// header menu
image_001=new Image();
image_001.src= jsdir + "image/comm_hm01_.gif";
image_002=new Image();
image_002.src= jsdir + "image/comm_hm02_.gif";
image_003=new Image();
image_003.src= jsdir + "image/comm_hm03_.gif";
image_004=new Image();
image_004.src= jsdir + "image/comm_mm01_.gif";
image_005=new Image();
image_005.src= jsdir + "image/comm_mm02_.gif";
image_006=new Image();
image_006.src= jsdir + "image/comm_mm03_.gif";
image_007=new Image();
image_007.src= jsdir + "image/comm_mm04_.gif";

// footer menu
image_101=new Image();
image_101.src= jsdir + "image/comm_fm03_.gif";

}
}