i think you want to achive this things like when user type on browser www.mysite.com it will Brouse your default.aspx
for that you create one HTML file in your root directory
and inside of this HTML Page
(1) create one JavaScript :
<script language="javascript" type="text/javascript">
function redirect()
{
document.location.href = "http://www.mysite.com/mysite/default.aspx";
}
</script>
(2) in your body onload event call this function so when user type www.mysite.com it will redirect your destination page
<body onload="redirect()">
<span>
if unable to redirect please click here <a href="http://www.mysite.com/mysite/default.aspx">Go to Mysite</a>
</span>
</body>
I hope U understand what i am saying to you.