(function __LoadImagesLikeFF(){    
    var imageelems = document.images;
    for(img=0;img<imageelems.length;img++){
        var ci = imageelems[img];
        _LoadImageStepByStep(ci);
    }
})();

function _LoadImageStepByStep(obj){
    var ci = obj;
    if(ci!=null){
        var el = ci.attributes["origsrc"];
        if(el!=null && typeof(el)!="undefined"){                
            var ni = new Image();
            ci.src = "Thumbnail.aspx?qual=low&filename=" + el.value;            
            ni.img = ci;
            ni.loaded = false;
            ni.onload = function(){
                if(this.loaded==false){
                    this.loaded = true;
                    this.img.src = this.src;
                }
            }
            ci.img = ni;
            ci.onload = function(){
                this.img.src = "Thumbnail.aspx?qual=high&filename=" + this.attributes["origsrc"].value;
            }
        }
    }
}