Hi Karthik,
After googling I got this solution and it is working fine for every browser.
..
<blockquote class="quote"><div class="op">Quote:</div><![CDATA[
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function handle(delta) {
var d=delta*-10;
window.scrollBy(0,d);
}
function wheel(event){
var delta = 0;
if (!event)
event = window.event;
if (event.wheelDelta) {
delta = event.wheelDelta/120;
if (window.opera)
delta = -delta;
} else if (event.detail) {
delta = -event.detail/3;
}
if (delta)
handle(delta);
if (event.preventDefault)
event.preventDefault();
event.returnValue = false;
}
if (window.addEventListener)
window.addEventListener('DOMMouseScroll', wheel, false);
window.onmousewheel = document.onmousewheel = wheel;
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<iframe width="300" height="300" scrolling="no" frameborder="1" src="http://www.w3schools.com"></iframe>
</div>
</form>
</body>
</html></blockquote>