preload_img=new Image();
preload_img.src='index/sbm_navi1.gif';
preload_img2=new Image();
preload_img2.src='index/sbm_navi2.gif';
preload_img3=new Image();
preload_img3.src='index/sbm_navi3.gif';
preload_img4=new Image();
preload_img4.src='index/sbm_navi4.gif';
preload_img5=new Image();
preload_img5.src='index/sbm_navi5.gif';
preload_img6=new Image();
preload_img6.src='index/sbm_navi6.gif';
preload_img7=new Image();
preload_img7.src='index/map_area1b.jpg';
preload_img8=new Image();
preload_img8.src='index/map_area2b.jpg';
preload_img9=new Image();
preload_img9.src='index/map_area3b.jpg';
preload_img10=new Image();
preload_img10.src='index/map_area4b.jpg';
preload_img11=new Image();
preload_img11.src='index/map_area5b.jpg';
preload_img12=new Image();
preload_img12.src='index/map_area6b.jpg';