function change_div_image(num){
if(num>=7){var num1=num-6;}else{var num1=num;}
var num2 = "side_btn0"+(num);
var num3 = "subbtn0"+(num1);
var url2 = "url(../img/land/"+num3+"b.jpg)";
document.getElementById(num2).style.backgroundImage = url2;
}
function change_div_image2(num){
if(num>=7){var num1=num-6;}else{var num1=num;}
var num2 = "side_btn0"+(num);
var num3 = "subbtn0"+(num1);
var url2 = "url(../img/land/"+num3+"a.jpg)";
document.getElementById(num2).style.backgroundImage = url2;
}
function change_div_image01(url3){
var url2 = "url("+url3+")";
document.getElementById("top_box").style.backgroundImage = url2;
}
function change_div_image_refo(url3,alphabet){
var url2 = "url("+url3+")";
var name2 = "topic_top_box02"+alphabet;
document.getElementById(name2).style.backgroundImage = url2;
}