ASP.Net change radio button via javascript from onblur attribute

Please help. I have a radio button group with two buttons and one text box. If the user clicks into and then out of the text box I want to check if the user has changed the value from the default (which is 0) and if the user has changed the value I want the radio button to automatically switch to yes (which is the second item in the radio button group index).

I added the onblur attribute to my textbox and have tried to get the javascript going with all sorts of methods to no avail...

tbxBid.Attributes.Add("onblur", String.Format("CheckBoxChange(this.value,{0},{1});", tbxBox.ClientID, rdbGroup.ClientID))
    <script type="text/javascript">
        function CheckManualEntry(value, txtBoxName, rdbName) {
            var old_price = txtBoxName.getAttribute("value");
            var rb = document.getElementsByName(rdbName);
            rb[1].checked = true;

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Kyle AbrahamsSenior .Net DeveloperCommented:

set your autopostback to true.
add an ontextchanged event handler.
AJAX it.
mrferrariAuthor Commented:
I want to use javasciprt. this is really small and simple. i cant figure it out though.

I don't want the page to autopostback...
Kyle AbrahamsSenior .Net DeveloperCommented:

tbxBid.Attributes.Add("onblur",   PASTE_FUNCTION_HERE)

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I don't understand the scope beyond just the basics you outlined. I was a little confused by your attribute assignment in the code behind because you were calling on ID's that you hadn't mentioned in your question (tbxBid and tbxBox). All that is to say I may have missed the mark because I had to simplify without having more information...

Anyway this should give you an idea of how to begin managing the situation. I just wrote something that addresses the very specific things you mentioned. Of course I imagine you have a bigger scope and will have to update it accordingly...
didn't mean to post that (just hit the enter key on accident)...see snippet
****ASPX CODE****
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
    <title>Change RadioButton</title>
    <script type="text/javascript">
		function CheckBoxChange(txtBx, rblID)
			if(txtBx.value != '0')
				var rblParent = document.getElementById(rblID);
				var rbl = rblParent.getElementsByTagName('input');
				rbl[0].checked = true;
    <form id="form1" runat="server">
		<span>Default Text Box</span>
		<asp:TextBox ID="tbxBid" runat="server" Text="0" />
		<asp:RadioButtonList ID="rdbGroup" runat="server">
			<asp:ListItem Value="0" Text="Yes" />
			<asp:ListItem Value="1" Text="No" />
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            'Keep in mind that if you are using an asp:radiobuttonlist then the tdbGroup.clientID you are sending below
            'is actually a table, and you have to use that to get at the radiobuttons inside
            tbxBid.Attributes.Add("onblur", String.Format("CheckBoxChange(this,'{0}');", rdbGroup.ClientID))
        End If
    End Sub

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mrferrariAuthor Commented:
bingo bango... that works great. thanks so much...
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