Below are three dummy images set refresh every 5 seconds image #1, 6 seconds image #2 and 7 seconds image #3. The trick is to make sure each image has a different, unique ID.
The html code for mulitple images on a single web is found in the text area below. Note: make sure to alter the html image code that is red to meet your needs, ie proper image ID, number of seconds between refreshes, etc. and make sure to specify a unique ID for EACH image and make sure the associated Javascript code refects that image id.
<img alt="Your desired image alt text." id="idOfImage1ToReload" onload="javascript:(function(){setTimeout(function(){document.getElementById('idOfImage1ToReload').src=document.getElementById('idOfImage1ToReload').src.split('?')[0] + '?time=' + new Date().getTime();},5000);}())" src="the url/web address to your image" title="Your desired image title text." />