var iValue, rNumber;







var img1 = new Image();
img1 = "http://www.colors-co.jp/mainimg/images/tokyo.jpg";



var img2 = new Image();
img2 = "http://www.colors-co.jp/mainimg/images/t4b_night.jpg";



var img3 = new Image();
img3 = "http://www.colors-co.jp/mainimg/images/scoo.jpg";



var img4 = new Image();
img4 = "http://www.colors-co.jp/mainimg/images/overture.jpg";



var img5 = new Image();
img5 = "http://www.colors-co.jp/mainimg/images/nanohana.jpg";



var img6 = new Image();
img6 = "http://www.colors-co.jp/mainimg/images/midi.jpg";



var img7 = new Image();
img7 = "http://www.colors-co.jp/mainimg/images/top_ilbar_in.jpg";



var img8 = new Image();
img8 = "http://www.colors-co.jp/mainimg/images/top_ilbar2.JPG";



var img9 = new Image();
img9 = "http://www.colors-co.jp/mainimg/images/kokura.jpg";



var img10 = new Image();
img10 = "http://www.colors-co.jp/mainimg/images/top_robot.jpg";



var img11 = new Image();
img11 = "http://www.colors-co.jp/mainimg/images/unagidani.jpg";



var img12 = new Image();
img12 = "http://www.colors-co.jp/mainimg/images/t4b.jpg";



var img13 = new Image();
img13 = "http://www.colors-co.jp/mainimg/images/j3.jpg";



var img14 = new Image();
img14 = "http://www.colors-co.jp/mainimg/images/divio-2.jpg";



var img15 = new Image();
img15 = "http://www.colors-co.jp/mainimg/images/divio-1.jpg";



var img16 = new Image();
img16 = "http://www.colors-co.jp/mainimg/images/abeno-2.jpg";



var img17 = new Image();
img17 = "http://www.colors-co.jp/mainimg/images/abeno-1.jpg";


function display_image(){
iValue = Math.random() * 17;
rNumber = Math.ceil(iValue);
if(rNumber==0) rNumber++;
document.image1.src=eval("img" + rNumber);
}