How to execute script tag in iframe?

here is the sample code:
<html>
<head></head>
<body>
<div id="unique_placeholder_id">
<div class="adHolder">
<iframe id="one" name="one" class="adFrame" style="border:3px solid blue;" width="500" height="500">
<html>
<head>
<script type="text/javascript">
alert("iam here");
function AdPageOnLoad(){
alert(parent.RMIFOnLoad);
if (parent.RMIFOnLoad)
{ setTimeout('parent.RMIFOnLoad(window, document);', 10);
}
}
</script>
</head>
<body onload='AdPageOnLoad(window, document);' style="overflow: visible; border:0;background-color:transparent;">

<div id="adDiv" style="overflow: visible; border:0;display:table;">
<script type="text/javascript">
var inDapIF = true;
var inFIF = true;
var RMIF = true;
alert("coming here");
//if (window.frameElement.parentNode.adHTML) {
document.write(document.getElementById("intro_Adcode").contentWindow.document.body.innerHTML);
//}
</script>
</div>
</body>
</html>
</iframe>
</div>
</div>
<div>
<iframe id="intro_Adcode" name="intro_Adcode" style="border:3px solid red;" src="http://cz.iozo.com/nilangi/intromercial_IEOperation/jsc/adcode.html">
<html>
<head>
</head>
<body>
<script type="text/javascript">
</script>
</body>
</html>
</iframe>
</div>
</body>
</html>

I am not able to get the alert.

Thanks
Nilangi