if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "images/ri_01.jpg";
      image_url[1] = "images/ri_02.jpg";
      image_url[2] = "images/ri_03.jpg";
      image_url[3] = "images/ri_04.jpg";
	  image_url[4] = "images/ri_05.jpg";
	  image_url[5] = "images/ri_06.jpg";
	  image_url[6] = "images/ri_07.jpg";
	  image_url[7] = "images/ri_08.jpg";
	  image_url[8] = "images/ri_09.jpg";
	  image_url[9] = "images/ri_10.jpg";
	  image_url[10] = "images/ri_11.jpg";

       var i = 0;
       for(i=0; i<=3; i++) 
         preload_image_object.src = image_url[i];
    }    
  
var currentdate = 0
var core = 0

function StringArray (n) {
  this.length = n;
  for (var i =1; i <= n; i++) {
    this[i] = ' '

  }
}

image = new StringArray(10)
image[0] = 'ri_01.jpg'
image[1] = 'ri_02.jpg'
image[2] = 'ri_03.jpg'
image[3] = 'ri_04.jpg'
image[4] = 'ri_05.jpg'
image[5] = 'ri_06.jpg'
image[6] = 'ri_07.jpg'
image[7] = 'ri_08.jpg'
image[8] = 'ri_09.jpg'
image[9] = 'ri_10.jpg'
image[10] = 'ri_11.jpg'

var ran = 60/image.length

function ranimage() {
  currentdate = new Date()
  core = currentdate.getSeconds()
  core = Math.floor(core/ran)
    return(image[core])
}

document.write("<img src='images/" +ranimage()+ "'>")