var agt=navigator.userAgent.toLowerCase();
var is_ie  = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));

function replaceImages(){
var arVersion = navigator.appVersion.split("MSIE")
var version = parseFloat(arVersion[1])
if (is_ie) {
if ((version >= 5.5) && (version < 7) && (document.body.filters)) 
{
var png1=document.getElementById? document.getElementById("png1") : document.all.png1;
var png2=document.getElementById? document.getElementById("png2") : document.all.png2;
var png3=document.getElementById? document.getElementById("png3") : document.all.png3;

replacePNG(png1,png1.src);
replacePNG(png2,png2.src);
replacePNG(png3,png3.src);

}
}
}

function replacePNG(dotImage,srcName){
if (dotImage.runtimeStyle){
dotImage.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + srcName + "', sizingMethod='image')";
dotImage.runtimeStyle.width="1px"
dotImage.runtimeStyle.height="1px"
dotImage.runtimeStyle.visibility="visible"
} else {
dotImage.src = srcName;
}
}
window.onload=replaceImages