var imgSizer = {
    Config : {
        imgCache : []
        ,spacer : "/path/to/your/spacer.gif"
    }

    ,collate : function(aScope) {
        var isOldIE = (document.all && !window.opera && !window.XDomainRequest) ? 1 : 0;
        if (isOldIE && document.getElementsByTagName) {
            var c = imgSizer;
            var imgCache = c.Config.imgCache;

            var images = (aScope && aScope.length) ? aScope : document.getElementsByTagName("img");
            for (var i = 0; i < images.length; i++) {
                images[i].origWidth = images[i].offsetWidth;
                images[i].origHeight = images[i].offsetHeight;

                imgCache.push(images[i]);
                c.ieAlpha(images[i]);
                images[i].style.width = "100%";
            }

            if (imgCache.length) {
                c.resize(function() {
                    for (var i = 0; i < imgCache.length; i++) {
                        var ratio = (imgCache[i].offsetWidth / imgCache[i].origWidth);
                        imgCache[i].style.height = (imgCache[i].origHeight * ratio) + "px";
                    }
                });
            }
        }
    }

    ,ieAlpha : function(img) {
        var c = imgSizer;
        if (img.oldSrc) {
            img.src = img.oldSrc;
        }
        var src = img.src;
        img.style.width = img.offsetWidth + "px";
        img.style.height = img.offsetHeight + "px";
        img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')"
        img.oldSrc = src;
        img.src = c.Config.spacer;
    }

    // Ghettomodified version of Simon Willison's addLoadEvent() -- http://simonwillison.net/2004/May/26/addLoadEvent/
    ,resize : function(func) {
        var oldonresize = window.onresize;
        if (typeof window.onresize != 'function') {
            window.onresize = func;
        } else {
            window.onresize = function() {
                if (oldonresize) {
                    oldonresize();
                }
                func();
            }
        }
    }
}