if(document.images) {
        var imgs = new Array();
        imgs[0] = new Image();  imgs[0].src = "../img/navi.gif"; 
        imgs[1] = new Image();  imgs[1].src = "../img/navi_02.gif"; 
        imgs[2] = new Image();  imgs[2].src = "../img/navi_03.gif"; 
        imgs[3] = new Image();  imgs[3].src = "../img/navi_04.gif"; 
        imgs[4] = new Image();  imgs[4].src = "../img/navi_05.gif"; 

        imgs[10] = new Image();  imgs[10].src = "img/history_1.jpg"; 
        imgs[11] = new Image();  imgs[11].src = "img/history_2.jpg"; 
        imgs[12] = new Image();  imgs[12].src = "img/wine_1.jpg"; 
        imgs[13] = new Image();  imgs[13].src = "img/wine_2.jpg"; 
        imgs[14] = new Image();  imgs[14].src = "img/mariage_1.jpg"; 
        imgs[15] = new Image();  imgs[15].src = "img/mariage_2.jpg"; 
        imgs[16] = new Image();  imgs[16].src = "img/fusui_1.jpg"; 
        imgs[17] = new Image();  imgs[17].src = "img/fusui_2.jpg"; 

       }

       function chgimg(id, imgname) {
        if(document.images) {
         if(imgs[imgname]) {
           document.images[id].src = imgs[imgname].src;
         }
         else {
           document.images[id].src = imgname;
         }
        }
       }