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<script type="text/javascript" src="Scripts/jquery-1.4.1.min.js"></script>
<script type="text/javascript">
function change() {
var txt = document.getElementById("<%=txtTest.ClientID %>");
txt.disabled = false;
}
</script>
<asp:TextBox ID="txtTest" runat="server"></asp:TextBox>
<asp:Button ID="btnTest" runat="server" Text="Button" OnClientClick="change();return false;" />
document.getElementById(' <%= Button1.ClientID %>').disabled = true;