What is wrong with the onKeyUp javascript event?
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function KeyReleased() {
var a = document.getElementById("TextBox1").value;
document.getElementById("divResult").innerHTML = a;
return true;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" onKeyUp="KeyReleased()" runat="server"></asp:TextBox>
<div id="divResult"></div>
</div>
</form>
</body>
</html>