Usen este. Copien y peguen y guardenlo como "iepngfix.htc"
<public:component>
<public:attach event="onpropertychange" onevent="doFix()" />
<script type="text/javascript">
// Path a una imagen en blanco. Generalmente es un gif de 4x4 transparente,
if (typeof blankImg == 'undefined') var blankImg = '/_assets/images/dummy.gif';
var f = 'DXImageTransform.Microsoft.AlphaImageLoader';
function filt(s, m)
{
if (filters[f])
{
filters[f].enabled = s ? true : false;
if (s) with (filters[f]) { src = s; sizingMethod = m }
}
else if (s) style.filter = 'progid:'+f+'(src="'+s+'",sizingMethod="'+m+'")';
}
function doFix()
{
// Si es IE7 esta todo OK.
if (!/MSIE (5\.5|6\.)/.test(navigator.userAgent) ||
(event && !/(background|src)/.test(event.propertyName))) return;
var bgImg = currentStyle.backgroundImage || style.backgroundImage;
if (tagName == 'IMG')
{
if ((/\.png$/i).test(src))
{
if (currentStyle.width == 'auto' && currentStyle.height == 'auto')
style.width = offsetWidth + 'px';
filt(src, 'scale');
src = blankImg;
}
else if (src.indexOf(blankImg) < 0) filt();
}
else if (bgImg && bgImg != 'none')
{
if (bgImg.match(/^url[("']+(.*\.png)[)"']+$/i))
{
var s = RegExp.$1;
if (currentStyle.width == 'auto' && currentStyle.height == 'auto')
style.width = offsetWidth + 'px';
style.backgroundImage = 'none';
filt(s, 'crop');
// IE link fix.
for (var n = 0; n < childNodes.length; n++)
if (childNodes[n].style) childNodes[n].style.position = 'relative';
}
else filt();
}
}
doFix();
</script>
</public:component>
Y luego en su CSS:
img, div, ul, li {
behavior: url(/_assets/css/iepngfix.htc);
}