Next: How can I refresh an image without refreshing the whole page?

How can I refresh an image without refreshing the whole page? 

 <script>  
 var reimg  
 window.onload=function () {  
  reimg=document.getElementById('re')  
  setInterval(function () {  
   reimg.src=reimg.src.replace(/\?.*/,function () {  
    return '?'+new Date()  
   })  
  },2000)  
 }  
 </script>  
 <img src="http://151.97.160.13/GetImage.cgi?CH=0" id="re">

where http://151.97.160.13/GetImage.cgi?CH=0 is the image that you ant refresh

and 2000 is the interval time in milleseconds.