document.getElementById(fadeImageID).style.opacity is working in firefox but its not working in ie

so what?

document.getElementById(fadeImageID).style.opacity is working in firefox but its not working in ie

<script>
    function lightup(imageobject, opacity){
    if (navigator.appName.indexOf("Netscape")!=-1&&parseInt(navigator.appVersion)>=5)
    imageobject.style.MozOpacity=opacity/100
    else if (navigator.appName.indexOf("Microsoft")!=-1&&parseInt(navigator.appVersion)>=4)
    imageobject.filters.alpha.opacity=opacity
}

</script>
<img src="test.gif" style="filter:alpha(opacity=50); -moz-opacity:0.5" 
onMouseover="lightup(this, 100)" onMouseout="lightup(this, 30)">

try the code above, if that doesn't help try:
http://www.akxl.net/labs/articles/use-javascript-to-change-or-fade-opacity-or-transparency-of-html-entities/

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