关于INPUT的动态效果，恳请获得帮助。

Question

<script language=javascript>
function doTrans() {
        event.srcElement.filters[0].apply();
            event.srcElement.style.backgroundColor = "gold";
        event.srcElement.filters[0].play();
}
function reTrans() {
       event.srcElement.filters[0].apply();
            event.srcElement.style.backgroundColor = "green";
        event.srcElement.filters[0].play();
}function attachStyle(){
var obj = document.all.tags("INPUT");
for(i=0;i<obj.length;i++){
  if(obj[i].type=="text"){
     obj[i].onfocus = doTrans;
     obj[i].onfocusout = reTrans; 
  }
}
}
window.attachEvent("onload",attachStyle);
</script>
<form name=form>
  <input name=txt type=text id=imgObj style="FILTER: progid:DXImageTransform.Microsoft.Fade(Overlap=0.75);background-Color:green" size=30>
  <input name=txt type=text style="FILTER: progid:DXImageTransform.Microsoft.Fade(Overlap=0.75);background-Color:green" size=30>
<input type=submit value=确定>
</form>