var imgArray = new Array(
"<img src='mk-img/inu01.jpg'  border=0 width=36 height=36>",
"<img src='mk-img/inu02.jpg'  border=0 width=36 height=36>",
"<img src='mk-img/inu03.jpg'  border=0 width=36 height=36>",
"<img src='mk-img/inu04.jpg'  border=0 width=36 height=36>",
"<img src='mk-img/inu05.jpg'  border=0 width=36 height=36>",
"<img src='mk-img/inu06.jpg'  border=0 width=36 height=36>"
);
var imageFile = imgArray[Math.floor(Math.random()*6)];
document.write(imageFile);