Web Forms :: Disable Ontextchange To Fire For Javascript?

Right now, I have a text box:

<asp:TextBox ID="Slider1" runat="server" AutoPostBack="True" OnTextChanged="Slider1_TextChanged"></asp:TextBox>

I also have this javascript function.

function InsertLabelData() {
PageMethods.GetLabelText(onSuccess, onFailure);
}
function onSuccess(result) {
//var lbl = document.getElementById('Slider11_mA');
document.getElementById("Slider11_mA").value =result;
}


I want manual inputs (if a user enters text inside teh textbox) to cause a postback. The ontextchanged event will be raised. HOWEVER, when this javascript function is called, it too will also set a value to the textbox. So how can I tell javascript to somehow temporarily disable the ontextchanged so that when it sets its own value, it wont' fire the postback?

Subsequently, when a user DOES go back and change teh value in the textbox, it too must also fire again.

so basically:

1. user can change textbox value and will cause postback with ontextchange.

2. javascript can also change textbox value but must not raise ontextchanged event. but must preserve the ontextchange event for the user.