try:
img.yourimg {
background: transparent;
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00FFFFFF)";
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#00FFFFFF,endColorstr=#00FFFFFF);
}
Or use PNG8 (it will create a small white frame around your images, but I think you do not want this).
Or as in my comment above.
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