var img = new Array;

img[0] = "http://sky-fld.net/image/common/cooking/01.jpg";
img[1] = "http://sky-fld.net/image/common/cooking/02.jpg";
img[2] = "http://sky-fld.net/image/common/cooking/03.jpg";
img[3] = "http://sky-fld.net/image/common/cooking/04.jpg";
img[4] = "http://sky-fld.net/image/common/cooking/05.jpg";
function random_img(){
        var i = myrandom(img.length) - 1;
        document.write("<IMG SRC=\""+img[i]+"\" />");
}
function myrandom(max){
        var v = max * Math.random();
        if(v == 0.0){v = 1;}else{v = Math.ceil(v);}
        return v;
}