prueba a poner el html dentro de un form con runat server:
Código PHP:
<HTML>
<HEAD>
<title>WebForm1</title>
<META http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta content="True" name="vs_showGrid">
<meta content="Microsoft Visual Studio.NET 7.0" name="GENERATOR">
<meta content="Visual Basic 7.0" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<script>
</script>
</HEAD>
<body background="file:///C:\Inetpub\wwwroot\Encuestas\fondo1.gif" MS_POSITIONING="GridLayout">
<form id="form1" runat="server">
<TABLE id="Table1" style="Z-INDEX: 101; LEFT: 40px; WIDTH: 456px; POSITION: absolute; TOP: 16px; HEIGHT: 96px" cellSpacing="1" cellPadding="1" width="456" border="1">
<asp:repeater id="repeater1" runat="server"></asp:repeater></TABLE>
</form>
</body>
</HTML>