Hey, this is the vary tricky issue in designing, it's tough to give 100 % height to page, but this is the solution for all browsers supported, try.....but i would suggest to give some fixed with and height before you put all your contents inside for handling internal scrolbars.
----------------------------------
<head runat="server">
<title>Untitled Page</title>
<style type="text/css">
body { overflow-y:auto; overflow-x : hidden; position:relative; height: 100%; margin:0 ; padding :0;}
.dvstyle
{
position:fixed; top:0; bottom:0; border: solid 1px black; width:99%; height:99%;
}
*html .dvstyle
{
position:absolute;top:0;bottom:0;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div class="dvstyle">
<table>
<tr>
<td style=" width: 100%; height: 100%">
Your contents are here.
</td>
</tr>
</table>
</div>
</form>
</body>
-------------------------------
visit this link also:
http://www.cssplay.co.uk/layouts/fixed.html#
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Thnks,