if (document.images) { 

 var img1on = new Image();
img1on.src = "img/img_db2.jpg";
 var img1off = new Image();
img1off.src = "img/img_db.jpg";

 var img2on = new Image();
img2on.src = "img/img_gb2.jpg";
 var img2off = new Image();
img2off.src = "img/img_gb.jpg";

 var img3on = new Image();
img3on.src = "img/img_rd2.jpg";
 var img3off = new Image();
img3off.src = "img/img_rd.jpg";

 var img4on = new Image();
img4on.src = "img/img_rl2.jpg";
 var img4off = new Image();
img4off.src = "img/img_rl.jpg";

 var img5on = new Image();
img5on.src = "img/img_hh2.jpg";
 var img5off = new Image();
img5off.src = "img/img_hh.jpg";

 var img6on = new Image();
img6on.src = "img/img_3p2.jpg";
 var img6off = new Image();
img6off.src = "img/img_3p.gif";

 var img7on = new Image();
img7on.src = "img/img_colt2.jpg";
 var img7off = new Image();
img7off.src = "img/img_colt.gif";

 var img8on = new Image();
img8on.src = "img/img_apollo2.jpg";
 var img8off = new Image();
img8off.src = "img/img_apollo.jpg";

 var img9on = new Image();
img9on.src = "img/img_jelly2.jpg";
 var img9off = new Image();
img9off.src = "img/img_jelly.jpg";

 var img10on = new Image();
img10on.src = "img/img_soldier2.gif";
 var img10off = new Image();
img10off.src = "img/img_soldier.gif";

 var img11on = new Image();
img11on.src = "img/img_tobikiri2.jpg";
 var img11off = new Image();
img11off.src = "img/img_tobikiri.gif";

 var img12on = new Image();
img12on.src = "img/img_anoyo2.jpg";
 var img12off = new Image();
img12off.src = "img/img_anoyo.gif";

 var img13on = new Image();
img13on.src = "img/img_act1_2.jpg";
 var img13off = new Image();
img13off.src = "img/img_act1_1.jpg";

 var img14on = new Image();
img14on.src = "img/img_act2_2.gif";
 var img14off = new Image();
img14off.src = "img/img_act2_1.gif";

 var img15on = new Image();
img15on.src = "img/img_kairai2.gif";
 var img15off = new Image();
img15off.src = "img/img_kairai.gif";


}


 function On(name) { 

 if (document.images) { 
 document.images[name].src = eval(name + 'on.src'); 
 } 
 }
 function Off(name) { 

 if (document.images) { 
 document.images[name].src = eval(name + 'off.src'); 
 } 
 }