JavaScript not setting ASP.NET RadioButtonList in IE, but works fine in FireFox

    // This sets "radBarrier" to YES if "radVeteran" 'Veteran' is selected.  Otherwise should unselect radVeteran.
    function SetHaveDisability(QuestionID)
    {
    	var rad = QuestionID;
    	var rbl = document.getElementById(rad);  //  The whole RadioButtonList Control
    	var rbl_0 = document.getElementById(rad + '_0');  //  "Disabled Veteran"
    	if (rbl_0.checked)
    	{
    		document.getElementById("radBarrier_0").checked = true;
    	} else
    	{
    	    document.getElementById("radBarrier_0").checked = false;
    	}
    }

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                        <asp:RadioButtonList ID="radVeteran" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow" onclick=" SetHaveDisability(this.id); ">
                            <asp:ListItem Value="Veteran" Text="Disabled Veteran" />
                            <asp:ListItem Value="Dependant" Text="Eligible Spouse of a Veteran" />
                            <asp:ListItem Value="Care Giver" Text="Care Giver of an ill, injured, or disabled Veteran" />
                            <asp:ListItem Value="Neither" Text="None of those." />
                        </asp:RadioButtonList>

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                    <asp:RadioButtonList ID="radBarrier" runat="server" RepeatDirection="Horizontal"
                        onclick="ShowHideBarrier(this.id);" RepeatLayout="Flow">
                        <asp:ListItem Value="Yes" Text="Yes" />
                        <asp:ListItem Value="No" Text="No" />
                        <asp:ListItem Value="DA" Text="N/A" />
                    </asp:RadioButtonList>

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