// JavaScript Document

function random_img1(num1,num2)
{
if((num1 - num2) > 0)
{
var big = num1
var small=num2
}else{
var big = num2
var small=num1
}
var range = big - small + 1
var number = Math.floor(Math.random()*range) + small
return(number)
}

//ランダム画像
function random_img2(){
var img_src="common/images/img_random"+ random_img1(1,3) + ".jpg"
document.write("<img src='"+ img_src + "'>")
}



//メニューボタン



var img = new Array();
img[0]=new Image();img[0].src="../common/images/navi_bg.jpg";
img[1]=new Image();img[1].src="../common/images/navi_bg1.jpg";

function b(x,y){

	if(document.getElementById){
		document.getElementById(x).style.backgroundImage='url('+img[y].src+')';
	}
	else if(document.all){
		document.all(x).style.backgroundImage='url('+img[y].src+')';
	}
}