window.attachEvent("onload", alphaBackgrounds);

function alphaBackgrounds() // correctly handle PNG "BACKGROUNDCOLOUR" transparency in Win IE 5.5 or higher.
{
var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5);
for (i=0; i<document.all.length; i++){
var bg = document.all[i].currentStyle.backgroundImage;
if (itsAllGood && bg){
if (bg.match(/\.png/i) != null){
var mypng = bg.substring(5,bg.length-2);
document.all[i].style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+mypng+"', sizingMethod='scale')";
document.all[i].style.backgroundImage = "url('/images/spacer.gif')";
}
}
}
}