[Holub]

No, not Smarty plugin but JS fix:
If I remember correctly you should exec function for element you which to fix, for example: <script>fixPNG(document.getElementById('YourPNGTra nsparentImage'));</script>

function fixPNG(element)
{
	if (/MSIE (5\.5|6).+Win/.test(navigator.userAgent))
	{
		var src;

		src = element.currentStyle.backgroundImage.match(/url\("(.+\.png)"\)/i)
		if (src)
		{
			src = src[1];
			element.runtimeStyle.backgroundImage="none";
		}
		
		if (src) element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "',sizingMethod='crop')";
	}
}

Also you can fix it via CSS:

background: url('/img/fur/input-text/bg.png') 0 0 no-repeat;
 -background-image: none;
 -filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=/img/fur/input-text/bg.png,sizingMethod=crop);