圖片隨機(jī)切換代碼

    <script language="JavaScript">
    var how_many_ads = 5
    var now = new Date()
    var sec = now.getSeconds()
    var ad = sec % how_many_ads;
    ad +=1;
    if (ad==1){
    url="";
    alt="ad1";
    banner="圖片/01.jpg";
    width="440";
    height="230";
    }
    if (ad==2) {
    url="";
    alt="ad2";
    banner="圖片/02.jpg";
    width="440";
    height="230";
    }
    if (ad==3) {
    url="";
    alt="ad3";
    banner="圖片/03.jpg";
    width="440";
    height="230";
    }
    if (ad==4) {
    url="";
    alt="ad4";
    banner="images/04.jpg";
    width="440";
    height="230";
    }
    if (ad==5) {
    url="";
    alt="ad5";
    banner="圖片/05.jpg";
    width="440";
    height="230";
    }
    document.write('<center>');
    document.write('<a href=\"' + url + '\" target=\"_blank\">');
    document.write('<img src=\"' + banner + '\" width=')
    document.write(width + ' height=' + height + ' ');
    document.write('alt=\"' + alt + '\" border=0>
    ');
    document.write('</center>');
    --></script>