image onload event issue when browser caches image

image-onload.js

/*
 * Had issue with browsers caching images and so they were not triggering an onload event.
 * This jQuery snippet helped fixed the issue.
 * 
 * UPDATE: 
 * Discovered that IE9 was having issues (IE7/8 were fine?)
 * So we used a 'cache-buster' technique which is to append a QueryString onto the end of the image URL
 */

var originalSource,
    imageList = $('img');

/*
 * Following function expression indicates whether the current rendering engine is Trident (i.e. Internet Explorer)
 * 
 * @return v { Integer|undefined } if IE then returns the version, otherwise returns 'undefined' to indicate NOT a IE browser
 */
var isIE = (function() {
    var undef,
        v = 3,
        div = document.createElement('div'),
        all = div.getElementsByTagName('i');

    while (
        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
        all[0]
    );

    return v > 4 ? v : undef;	
}());

// If we're not using IE then we can use the img.complete property to determine if image is loaded
if (!isIE) {
  
    // Execute the 'load' event only once
    $(imageList).one('load', function() {
        // Do stuff on image load
    })
    // Loop through each image found
    .each(function() {
        // Check if the image 'complete' property has been set to true
        // See: https://developer.mozilla.org/en/DOM/HTMLImageElement#DOM_properties
        if(this.complete) {
            // Trigger the load event for each image
            $(this).load();
        }
    });
  
} else {
   
    // Loop through each image found
    $(imageList).each(function(){
        
        // Keep a reference to the original src
        originalSource = this.src;

        // Reset the src attribute so it includes a QueryString (this is the 'cache-buster' technique)
        this.src = originalSource + '?' + new Date().getTime();

    }).on('load', function(){
        // Do stuff on image load 
    });
    
}

this might be useful: https://github.com/desandro/imagesloaded (check source comments)

thanks @millermediros I'll check that out :-)