// JavaScript Document
var img = new Array;
img[0] = "http://www.taiwa.ac.jp/study/img/head.jpg";
img[1] = "http://www.taiwa.ac.jp/study/img/head_f2.jpg";
img[2] = "http://www.taiwa.ac.jp/study/img/head_f3.jpg";
img[3] = "http://www.taiwa.ac.jp/study/img/head_f4.jpg";
img[4] = "http://www.taiwa.ac.jp/study/img/head_f5.jpg";
function random_img(){
        var i = myrandom(img.length) - 1;
        document.write("<a href=\"http://www.taiwa.ac.jp/study/\"><IMG SRC=\""+img[i]+"\" boder=0></a>");
}
function myrandom(max){
        var v = max * Math.random();
        if(v == 0.0){v = 1;}else{v = Math.ceil(v);}
        return v;
}