// JavaScript Document
window.onload = function(){
//var url = "a.jpg,b.jpg,c.jpg".split(',');
var url=[];
url[0] = 'kashi_01.png';
url[1] = 'kashi_02.png';
url[2] = 'kashi_03.png';
url[3] = 'kashi_04.png';
url[4] = 'kashi_05.png';
url[5] = 'kashi_06.png';
url[6] = 'kashi_07.png';
url[7] = 'kashi_08.png';
url[8] = 'kashi_09.png';
url[9] = 'kashi_10.png';
url[10] = 'kashi_11.png';
var n = Math.floor(Math.random() * url.length);
var elm = document.getElementById('kashi');
elm.style.backgroundImage = 'url(common/img/' + url[n] + ')';
}