var n=6;
var mc;
mc=Math.ceil(Math.random()*n);

function spic(){
  switch(mc){
       case 1:
            return "http://i3.6.cn/cvbnm/78/73/cf/68b639b9f143b525f45ed7bca750af82.jpg";
            break;
       case 2:
            return "http://i3.6.cn/cvbnm/e7/c1/05/6399c32a3f6b5c0d57f0988274981c39.jpg";
            break;
       case 3:
            return "http://i3.6.cn/cvbnm/12/52/2d/9274150127dcc37c29ef736b48550522.jpg";
            break;
       case 4:
            return "http://i3.6.cn/cvbnm/17/96/32/eb04b83980451cb42ed8392635867e04.jpg";
            break;
       case 5:
            return "http://i3.6.cn/cvbnm/2f/47/46/ea974051c19fa701e4a24b2c30161ca7.jpg";
            break;
       case 6:
            return "http://i3.6.cn/cvbnm/cb/4c/b6/bceb53be449a37276d39e93e8cb619d6.jpg";
            break;
       default:
            return "http://i3.6.cn/cvbnm/12/52/2d/9274150127dcc37c29ef736b48550522.jpg";
            break;
  }
}

function znum(i){
   if (i<10) return "0"+i;
   else return i;
}

document.write("<div id='liyugang' align='center'><img border='0' src="+spic()+" alt='ÀîÓñ¸Õ' onerror=\"this.src='liyugang"+znum(mc)+".jpg';\"></div><br />");