function display_random_image()   
    {  
         var theImages = [{  
            src: "http://farm4.staticflickr.com/3691/11268502654_f28f05966c_m.jpg",  
            width: "240",  
            height: "160"  
        }, {  
            src: "http://farm1.staticflickr.com/33/45336904_1aef569b30_n.jpg",  
            width: "320",  
            height: "195"  
        }, {  
            src: "http://farm6.staticflickr.com/5211/5384592886_80a512e2c9.jpg",  
            width: "500",  
            height: "343"  
        }];  
          
        var preBuffer = [];  
        for (var i = 0, j = theImages.length; i < j; i++) {  
            preBuffer[i] = new Image();  
            preBuffer[i].src = theImages[i].src;  
            preBuffer[i].width = theImages[i].width;  
            preBuffer[i].height = theImages[i].height;  
        }  
         
    // create random image number  
      function getRandomInt(min,max)   
        {  
          //  return Math.floor(Math.random() * (max - min + 1)) + min;  
          
    imn = Math.floor(Math.random() * (max - min + 1)) + min;  
        return preBuffer[imn];  
        }    
      
    // 0 is first image,   preBuffer.length - 1) is  last image  
        
    var newImage = getRandomInt(0, preBuffer.length - 1);  
       
    // remove the previous images  
    var images = document.getElementsByTagName('img');  
    var l = images.length;  
    for (var p = 0; p < l; p++) {  
        images[0].parentNode.removeChild(images[0]);  
    }  
    // display the image    
    document.body.appendChild(newImage);  
    }