how to change the image when a page is refreshed using JavaScript?

Question

I want to change the image when the page is refresh using html. I place my partial code here. i want a script or anything do change the image when the page gets refresh.. Please help me to do this using html ...

        <div class="one-image">
           <a href="">
            <img src="img/IMG_1035.jpg" class="giThumbnail" alt="Nightclubs"></a><h4 class="giDescription">
             Nightclubs</h4>
             </div>

the above image tag image is change every refresh.. please help me ..

Answer 1

I believe this would work, but all your images would have to be sequentially named, e.g. 1-100. Also note that the script was placed AFTER the IMG tag.

<div class="one-image">            
  <a href="">             
    <img id="imgRand" src="" class="giThumbnail" alt="Nightclubs">
  </a>
  <h4 class="giDescription">              
    Nightclubs
  </h4>              
</div> 

<script language="javascript">
  // random number between 1 and 100
  var numRand = Math.floor(Math.random()*101);
  document.getElementById("imgRand").src = "img/IMG_"+numRand+".jpg";
</script>

The random formula in JS is:

var random = Math.floor(Math.random() * (max - min + 1)) + min; 

so if you only had 5 images between 135 and 140 your script would look like:

var random = Math.floor(Math.random() * (140 - 135 + 1)) + 135; 

If you wanted to change the image client-side, like a slideshow, just add a timer.

<script language="javascript">
  function setImg(){
  // random number between 1 and 100
  var numRand = Math.floor(Math.random()*101);
  document.getElementById("imgRand").src = "img/IMG_"+numRand+".jpg";}


  // call it the first time
  setImg();

  // set an interval to change it every 30 seconds
  window.setInterval("setImg()",30000);
</script>