function rnd_img(){
    img = new Array
    img[0] = "http://blog2.fc2.com/r/rman75/file/Now1.gif";
    img[1] = "http://blog2.fc2.com/r/rman75/file/Now.gif";
    img[2] = "http://blog2.fc2.com/r/rman75/file/noimage.gif";
    
    rnd = Math.floor(Math.random() * img.length);
    document.write("<img src='",img[rnd],"'>");}