Every designer would have faced this issue, obviously! Though there are a number of javascript based solutions, I couldn�t find anything that supports background position. As far as I know all JS based solutions end up with the same result. This is something that worked flawlessly for me. All other solutions are based on this filter.
.class_name
{
background:none;
filter: progid
XImageTransform.Microsoft.AlphaImageLoader (src='image_name.png', sizingMethod='scale');
}